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DELL OptiPlex 780

1. A possible processor Reseat the processor see Processor information for your computer failure has occurred If the problem persists contact Dell Memory modules are If two or more memory modules are installed remove the modules then detected but a memory reinstall one module and restart the computer If the computer starts failure has occurred normally continue to install additional memory modules one at a time until you have identified a faulty module or reinstalled all modules without error If available install working memory of the same type into your computer If the problem persists contact Dell A possible graphics Reseat any installed graphics cards card failure has If available install a working graphics card into your computer occurred If the problem persists contact Dell T A possible floppy drive Reseat all power and data cables ooo or hard drive failure has occurred T A possible USB failure Reinstall all USB devices and check all cable connections 0191919 has occurred No memory modules 9101010 are detected Memory modules are detected but a memory configuration or compatibility error has occurred A possible expansion card failure has occurred Another failure has occurred Back to Contents Page If two or more memory modules are installed remove the modules then reinstall one module and restart the computer If the computer starts normally continue to install additional
2. Auto On Time Low Power Remote Wake up Suspend Mode Fan Control Override Maintenance Service Tag Asset Tag SERR Messages Image Server Lookup Method ImageServer IP Determines how the system responds when AC power is re applied after a power loss You can set the AC Recovery to e Power Off default e Power On e Last State Sets time to automatically turn on the computer Time is kept in the standard 12 hour format hours minutes seconds Change the startup time by typing the values in the time and AM PM fields NOTE This feature does not work if you turn off your computer using the switch on a power strip or surge protector or if Auto Power On is set to disabled Enables or disables low power mode This option is disabled by default When low power mode is enabled the integrated network card is disabled when the system is shutdown or in Hibernate mode Only Add in NIC cards will be able to remotely wake the system Allows the system to power up when a network interface controller receives a wake up signal You can set Remote Wake up to e Disable default e Enable e Enable with Boot NIC Sets the power management suspend mode to e S1 e S3 default NOTE If the AMT Management Engine ME of the system is disabled the S1 suspend mode is unavailable in the system setup Controls the speed of the system fan NOTE When enabled the fan runs at full speed Displays the Service Tag of your
3. 10 to 20 minutes and requires no interaction on your Test part Run Express Test first to increase the possibility of tracing the problem quickly Extended Performs a thorough check of devices This test typically takes 1 hour or more and requires you to answer Test questions periodically Custom Tests a specific device You can customize the tests you want to run Test Symptom Lists the most common symptoms encountered and allows you to select a test based on the symptom of the Tree problem you are having If a problem is encountered during a test a message appears with an error code and a description of the problem Write down the error code and problem description and follow the instructions on the screen 3 If you run a test from the Custom Test or Symptom Tree option click the applicable tab described in the following table for more information Tee fems OOS Configuration Displays your hardware configuration for the selected device The Dell Diagnostics obtains configuration information for all devices from system setup memory and various internal tests and it displays the information in the device list in the left pane of the screen The device list may not display the names of all the components installed on your computer or all devices attached to your computer Parameters Allows you to customize the test by changing the test settings 4 When the tests are completed if you are running the Dell Diagnostics from
4. Operating Systems with USB support will recognize USB Floppy drives regardless of this setting e Disable All Floppy drive are disable e Enable All floppy drive are enable The USB Controller Setup option will affect floppy operation SATA configures the operating mode of the integrated hard drive controller Operation e RAID Autodetect AHCI RAID if signed drives otherwise AHCI e RAID Autodetect ATA RAID if signed drives otherwise ATA e RAID On ATA SATA is configured for RAID on every boot e Legacy The hard drive controller is configured for legacy mode Legacy mode provides for compatibility with some older operating systems that do not support native resources assigned to the drive controller RAID Mode is incompatible with mageServer Please disable RAID mode if enabling I mage Server S M A R T This field controls whether hard drive errors for integrated drives are reported during system startup This technology is part of the SMART Self Reporting Monitoring Analysis and Reporting Technology specification This option is disabled by default Drives Enables or disables the SATA or ATA drives connected to the system board System Configuration Integrated NIC Enables or disables the integrated network card You can set the integrated NIC to e Disable e Enable default e Enable with PXE e Enable with I mageSever ImageServe is incompatible with RAID mode Please disable RAID if enabling ImageServ
5. com regulatory_compliance Removing the Expansion Card s 1 Follow the procedures in Before Working Inside Your Computer 2 Rotate the release tab on the card retention latch upwards 3 Gently pull the release lever away from the card and then ease the card up and out of its connector on the system board Replacing the Expansion Card s To replace the expansion card perform the above steps in reverse order Back to Contents Page Back to Contents Page Memory Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Memory Module s 1 Follow the procedures in Before Working Inside Your Computer 2 Press out on the securing clips at each end of the memory module connector binding e 3 Lift the memory module out of the connector and remove it from the computer ast hae lhe t i s a ob Bi enats SETS quest F p A 5 P Pa Replacing the Memory Module s To replace the memory module s perform the above steps in reverse order Back to Contents Page Back to Contents Page Power Supply Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with you
6. computer Allows you to create a system asset tag if an asset tag is not already set This option is not set by default Controls the SERR Message mechanism This option is enabled by default Some graphics cards require the SERR Message mechanism be disabled Specifies how the ImageServer looks for the server address e Static IP e DNS NOTE You must set the Integrated NIC to Enable with I mageServer to set the Lookup Method Specifies the primary static IP address of the mageServer with which the client software communicates The default IP address is 255 255 255 255 NOTE You must set the Integrated NIC to Enable with I mageServer to set the mageServer IP ImageServer Port Specifies the primary IP port of the image server with which the client software communicates The default IP port is 06910 Client DHCP Specifies how the client obtains the IP address e Static IP e DHCP default Client IP Specifies the static IP address of the client The default IP address is 255 255 255 255 NOTE To set the Client IP you must set the Client DHCP to the Static IP Client SubnetMask Specifies the subnet mask for the client The default setting is 255 255 255 255 NOTE To set Client Subnet Mask you must set Client DHCP to Static IP Client Gateway Specifies the gateway IP address for the client The default setting is 255 255 255 255 NOTE To set Client Subnet Mask you must set Client DHCP to Static IP License Status Displays th
7. memory modules one at a time until you have identified a faulty module or reinstalled all modules without error If available install working memory of the same type into your computer If the problem persists contact Dell Ensure that no special requirements for memory module connector placement exist Ensure that the memory you are using is supported by your computer see the Specifications section for your computer If the problem persists contact Dell Determine if a conflict exists by removing an expansion card not a graphics card and restarting the computer If the problem persists reinstall the card you removed then remove a different card and restart the computer Repeat this process for each expansion card installed If the computer starts normally troubleshoot the last card removed from the computer for resource conflicts If the problem persists contact Dell Ensure that all hard drive and optical drive cables are properly connected to the system board If there is an error message on the screen identifying a problem with a device such as the floppy drive or hard drive check the device to make sure it is functioning properly If the operating system is attempting to boot from a device such as the floppy drive or optical drive check system setup to ensure the boot sequence is correct for the devices installed on your computer If the problem persists contact Dell Back to Contents Page Syste
8. the boot order stored in the BIOS lt F2 gt Press lt F2 gt to enter System Setup and make changes to user definable settings If you have trouble entering System Setup using this key press lt F2 gt when the keyboard lights first flash System Setup Menu Options E NOTE System Setup options may vary depending on your computer and may not appear in the exact same order System Displays the following information Board e System information Displays BIOS Info System Info Service Tag Express Service Code Asset Tag Manufacture Date and the Ownership Date e Memory information Displays Installed Memory Usable Memory Memory Speed Memory Channel Mode Memory Technology DIMM_1 Size DIMM_2 Size DIMM_3 Size and DIMM_4 Size e Processor information Displays the Processor Type Processor Speed Processor Bus Speed Processor L2 cache Processor ID Microcode Version Multi Core Capable and HT Capable 64 bit Technology e PCI information Displays available slots on the system board Date Time Displays the system date and time Changes to the system date and time take effect immediately Boot Specifies the order in which the computer attempts to find an operating system from the devices specified in this list Sequence e Onboard or USB Floppy e HDD will show the model currently in system e Onboard or USB CD Rom Drive e USB Device Diskette drive This field determines how the BIOS configures floppy drives
9. the Drivers and Utilities disc remove the disc 5 Close the test screen to return to the Main Menu screen To exit the Dell Diagnostics and restart the computer close the Main Menu screen Power Button Light Codes The diagnostic lights give much more information about the system state but legacy power light states are also supported in your computer The power light states are shown in following table Description Off Blinking Amber Blinking Green Power is off light is blank Initial state of light at power up Indicates system has power but the POWER_GOOD signal is not yet active If the Hard Drive light is off it is probable that the power supply needs to be replaced If the Hard Drive light on it is probable that an onboard regulator or VRM has failed Look at the diagnostic lights for further information Second state of the light at power up Indicates the POWER_GOOD signal is active and it is probable that the power supply is fine Look at the diagnostic lights for further information System is in a low power state either S1 or S3 Look at the diagnostic lights to determine which state the system is In System is in SO state the normal power state of a functioning machine The BIOS will turn the light to this state to indicate it has started fetching op codes Beep Codes If the monitor cannot display error messages during the POST the computer may emit a series of beeps that identifies the p
10. CI Express x16 one 164 pin connector data width maximum 16 PCI Express lanes Serial ATA Mini tower four 7 pin connectors Desktop three 7 pin connectors Small form factor three 7 pin connectors Internal USB device one 10 pin connector supports two USB ports Processor fan one 5 pin connector Hard drive fan one 5 pin connector Front panel control one 40 pin connector Processor one 775 pin connector Controls and Lights Front of the computer Power button push button Power light blinking green indicates that the computer is in sleep state solid green indicates that the computer is in power on state blinking amber indicates a problem with the system board solid amber indicates that the system board is unable to initialize Drive activity light blinking green indicates that the computer is reading data from or writing data to the hard drive Network connectivity light green indicates that a good connection exists between the network and the computer off no light indicates that the computer is not detecting a physical connection to the network Diagnostic lights four lights For more information see Diagnostics Back of the computer Link integrity light on integrated green a good 10 Mbps connection network adapter exists between the network and the computer orange a good 100 Mbps connection exists between the network and the computer yellow a good 1000 Mbps
11. Dell OptiPlex 780 Service Manual Desktop Computer Working on Your Computer Removing and Replacing Parts Specifications Diagnostics System Setup Notes Cautions and Warnings K NOTE A NOTE indicates important information that helps you make better use of your computer CAUTI ON A CAUTI ON indicates potential damage to hardware or loss of data if instructions are not followed A WARNING A WARNING indicates a potential for property damage personal injury or death If you purchased a Dell n Series computer any references in this document to Microsoft Windows operating systems are not applicable Information in this document is subject to change without notice 2009 Dell Inc All rights reserved Reproduction of this material in any manner whatsoever without the written permission of Dell Inc is strictly forbidden Trademarks used in this text Dell the DELL logo OptiPlex are trademarks of Dell Inc Intel Core and Celeron are registered trademarks of Intel Corporation in the U S and other countries Microsoft Windows Windows Server MS DOS and Windows Vista are either trademarks or registered trademarks of Microsoft Corporation in the United States and or other countries Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products Dell Inc disclaims any proprietary interest in trademarks and trade names other than its o
12. Hz Operating 40 G 5 with pulse duration of 2 msec 10 equivalent to 20 in sec 51 cm sec Storage 105 G 5 with pulse duration of 2 msec 10 equivalent to 50 in sec 127 cm sec Altitude Airborne contaminant level G2 or lower as defined by ISA S71 04 1985 Back to Contents Page Back to Contents Page Diagnostics Dell OptiPlex 780 Service Manual Dell Diagnostics Power Button Light Codes Beep Codes Diagnostic Lights Dell Diagnostics When to Use the Dell Diagnostics It is recommended that you print these procedures before you begin Ki NOTE The Dell Diagnostics software works only on Dell computers K NOTE The Drivers and Utilities media is optional and may not ship with your computer Enter system setup see Entering System Setup review your computer s configuration information and ensure that the device you want to test displays in System Setup and is active Start the Dell Diagnostics from either your hard drive or from the Drivers and Utilities media Starting the Dell Diagnostics From Your Hard Drive 1 Turn on or restart your computer 2 When the DELL logo appears press lt F12 gt immediately NOTE If you see a message stating that no diagnostics utility partition has been found run the Dell Diagnostics from your Drivers and Utilities media If you wait too long and the operating system logo appears continue to wait until you see the Microsoft Window
13. SB Rear Quad USB PCI slots Audio Primary This field determines which video controller will become the primary video controller when 2 controllers are available in the system This selection Video matters only if there are 2 video controller present Performance Multi Core Support Intel SpeedStep C States Control Limit CPUID Value HDD Acoustic Mode e Auto default Use the add in video controller e Onboard Card Use the integrated video controller unless a Graphic care is installed A PCI Express Graphic PEG card will override and disable the integrated video controller This field specifies whether the processor will have one or all cores enable The performance of some application will improve with the additional cores This Option enables or disables the Intel SpeedStep mode of the processor When disabled the system is placed into the highest performance state and the Intel SpeedStep applet or native operating system driver are prevented from adjusting the processor s performance When enable the Intel SpeedStep enabled CPU is allowed to operate in multiple performance states This option is disabled by default This option enables or disables additional processor sleep states The operating system may optionally use these for additional power saving when idle This option is disabled by default This field limits the maximum value the processor Standard CPUID Function will support Some
14. abled by default Provides restricted access to the computer s system setup program in the same way that access to the system can be restricted with the System Password option This option is not set by default ord Displays the current status of the system s password security feature and allows a new system password to be assigned and verified This option is not set by default Password Changes Enables or disables the user from changing the system password without the administrative password TPM Security This option is enabled by default Enables or disables the trusted platform module TPM security CPU XD Support Computrace R You can set the TPM security to e Deactivate default e Activate e Clear NOTE When TPM Security is set to Clear the system setup program clears the user information stored in the TPM Enables or disables the execute disable mode of the processor This option is enabled by default Enables or disables the optional Computrace service designed for asset management You can set this option to e Deactivate default e Disable e Activate SATA O Password Displays the current status of the password set for the hard drive connected to the SATA O connector on the system board You can also set a new password This option is not set by default NOTE The system setup program displays a password for each of the hard drives connected to your system board Power Management AC Recovery
15. atory_compliance Removing the Fan 1 Follow the procedures in Before Working Inside Your Computer 2 Disconnect the fan power cable from the system board 3 Pull out the fan retention tab and then shift the fan towards the system board 4 Lift the fan and remove it from the computer Replacing the Fan To replace the fan perform the above steps in reverse order Back to Contents Page Back to Contents Page System Board Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the System Board Follow the procedures in Before Working Inside Your Computer Remove the riser cage Remove the heat sink and processor Remove the memory Disconnect the floppy drive data cable from the system board UWBWNE 6 Disconnect the fan power cable ffs fA ghee i i Cesis MN 7 Disconnect the main power cable from the system board Ws c li Ces SE M 8 Disconnect the lO panel cable iil i 9 Disconnect the optical drive data cable from the system board Aye GN O Ai mii PE 10 Disconnect the hard drive data cable from the system board Pep a e ii fw ma i 11 Disconnect the proc
16. connection exists between the network and the computer off no light the computer is not detecting a physical connection to the network Network activity light on integrated yellow light A blinking yellow light network adapter indicates that network activity is present DC power supply Wattage Mini tower 305 W non EPA or 255 W EPA Desktop 255 W EPA Small form factor 235 W EPA Maximum heat dissipation Mini tower 1041 BTU hr Desktop 955 BTU hr Small form factor 938 BTU hr Coin cell battery 3 V CR2032 lithium coin cell NOTE Heat dissipation is calculated by using the power supply wattage rating NOTE See the safety information that shipped with your computer for important voltage setting information Physical Height Mini tower 40 80 cm 16 10 inches Desktop 11 40 cm 4 50 inches Small form factor 9 26 cm 3 65 inches Width Mini tower 18 70 cm 7 40 inches Desktop 39 90 cm 15 70 inches Small form factor 31 40 cm 12 40 inches Depth Mini tower Desktop Small form factor Weight Mini tower Desktop Small form factor 43 30 cm 17 00 inches 35 30 cm 13 90 inches 34 00 cm 13 40 inches 11 70 kgs 25 80 Ibs 8 26 kgs 18 20 Ibs 6 80 kgs 15 00 Ibs Relative humidity noncondensing operating 20 to 80 maximum wet bulb temperature 29 C Storage 5 to 95 maximum wet bulb temperature 38 C 5 to 350 Hz at 0 0002 G Hz 5 to 500 Hz at 0 001 to 0 01 G7
17. e current license status Post Behavior Fast Boot When enabled default your computer starts more quickly because it skips certain configurations and tests NumLock Enables or disables the NumLock feature when your computer starts LED When enabled default this option activates the numeric and mathematical features shown at the top of each key When disabled this option activates the cursor control functions labeled on the bottom of each key POST Allows you to specify the function keys to display on the screen when the computer starts Hotkeys e Enable F2 Setup enabled by default e Enable F12 Boot menu enabled by default Keyboard Enables or disables keyboard error reporting when the computer starts Errors This option is enabled by default MEBx Sign on displays a message stating the keystroke sequence required to enter the Manageability Engine BIOS Extensions MEBx Setup program Hotkey This option is enabled by default Set the system maximum memory for OS to load while installation If enabled the maximum available memory is 256MB RAM OS Install This option is disable by default Reason being some operating system will not complete install with more then 2GB of system memory System Logs BIOS Events Displays the system event log and allows you to e Clear Log e Mark all Entries Back to Contents Page Back to Contents Page Cover Dell OptiPlex 780 Service Manual Desktop WARNING Be
18. er PXE is needed only if intending to boost to an operating system located on a server not if you are booting on an OS located on a hard drive in this system This field enable and disable the internal USB for Flex Bay you can set e Disable Internal USB for Flex Bay is disable e Enable Internal USB for Flex Bay is enable e No Boot Internal USB for Flex Bay is enable but not bootable default USB for Flex bay USB Controller Enables or disables the integrated USB controller You can set the USB controller to e Enable default e Disable e No boot Operating systems with USB support will recognize USB Storage Parallel Port Identifies and defines the parallel port settings You can set the parallel port to Disable AT PS 2 default EPP ECP No DMA ECP DMA 1 ECP DMA 3 Parallel Port Sets the base I O address of the integrated parallel port Address Serial Port 1 Identifies and defines the serial port settings You can set the serial port to e Disable e Auto default e COM1 e COM3 Serial Port 2 Miscellaneous Devices Video The Operating System may allocate resources even though the setting is disabled Identifies and defines the serial port settings You can set the serial port to e Disable e Auto default e COM2 e COM4 The Operating System may allocate resources even though the setting is disabled Enables or disables the following onboard devices Front USB Rear Dual U
19. essor power cable 12 Remove the screws that secure the system board to the computer chassis l is x a g f i a sen r I d bg r Pure a s P G Om al E J i 4 e a Ei r ag B 13 Remove the heat sink assembly bracket T TE e INANON ceses MIN 14 To remove the system board slide the system board towards the back of the computer and lift the system board up and away from the computer ii l 4 L E k io i ha E p E ir ai my a mii Replacing the System Board To replace the system board perform the above the steps in reverse order Back to Contents Page Back to Contents Page Optical Drive Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Optical Drive 1 Follow the procedures in Before Working Inside Your Computer 2 Disconnect the optical drive data cable 3 Disconnect the optical drive power cable 4 Lift the drive release latch and then slide the drive towards the back of the computer 5 Lift and remove the drive from the computer Replacing the Optical Drive To replace the optical drive perform the steps above in reverse Back to Contents Page order Back
20. everse order Back to Contents Page Back to Contents Page IO Panel Dell OptiPlex 780 Service Manual Desktop WARNING Before working Inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the 1O Panel 1 Follow the procedures in Before Working Inside Your Computer 2 Disconnect and remove the lO panel cable 3 Remove the screw that secures the IO panel to the computer 4 Gently rotate the IO panel away from the computer and then remove it from the computer Ci Replacing the 10 Panel To replace the IO panel perform the above steps in reverse order Back to Contents Page
21. fore working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Cover K NOTE You may need to install Adobe Flash Player from Adobe com to view the following illustrations 1 Follow the procedures in Before Working Inside Your Computer 2 Pull back the cover release latch E E Han SSESSSRSRECe ccssss mi 2465455555560 0555656 kk bh saceseecssess 352 bestt AAS Ssss Titi S45 B2654555555566655605009 gt 3 Tilt the cover outward from the top and then remove the cover from the computer La ki i3 nr a ia Replacing the Cover To replace the cover perform the steps above in reverse order Back to Contents Page Back to Contents Page Primary Hard Drive Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Primary Hard Drive 1 Follow the procedures in Before Working Inside Your Computer 2 Remove the optical drive from the computer 3 If present remove the secondary hard drive from the computer 4 Disconnect the hard drive data cable 5 Disconnect the
22. ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface such as a connector on the back of the computer CAUTION Handle components and cards with care Do not touch the components or contacts on a card Hold a card by its edges or by its metal mounting bracket Hold a component such as a processor by its edges not by its pins CAUTION When you disconnect a cable pull on its connector or on its pull tab not on the cable itself Some cables have connectors with locking tabs if you are disconnecting this type of cable press in on the locking tabs before you disconnect the cable As you pull connectors apart keep them evenly aligned to avoid bending any connector pins Also before you connect a cable ensure that both connectors are correctly oriented and aligned NOTE The color of your computer and certain components may appear differently than shown in this document To avoid damaging your computer perform the following steps before you begin working inside the computer 1 2 A N OU WwW Ensure that your work surface is flat and clean to prevent the computer cover from being scratched Turn off your computer see Turning Off Your Computer CAUTI ON To disconnect a network cable first unplug the cable from your computer and then unplug the cable from the network device Disconnect all network cables from the computer Disconnect your computer and all attached devices from the
23. hard drive power cable 6 Press in on the blue securing tabs on each side of the drive and then slide the drive towards the back of the computer 7 Lift the hard drive and remove it from the system Replacing the Primary Hard Drive To replace the hard drive perform the above steps in reverse order Back to Contents Page Back to Contents Page Floppy Drive Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Floppy Drive 1 Follow the procedures in Before Working Inside Your Computer 2 Disconnect the floppy drive data cable 3 Disconnect the floppy drive power cable 4 Pull up on the drive release latch and then slide the floppy drive towards the back of the computer 5 Lift the floppy drive up and away from the computer Replacing the Floppy Drive To replace the floppy drive peform the above steps in reverse order Back to Contents Page Back to Contents Page Expansion Card s Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell
24. ile card NOTE The PCI Express x16 slot is disabled when a display is connected to the integrated video connector Externally accessible 5 25 inch drive bay s Mini tower Desktop Small form factor 3 5 inch drive bay Mini tower Desktop Small form factor Internally accessible 3 5 inch drive bay s Mini tower Desktop Small form factor for SATA DVD ROM DVD RW or CD RW drives two bays one bay one slimline bay for 19 in 1 Media Card Readers one bay one bay one slimline bay for hard drives two bays one bay one bay NOTE Your computer can support up to two 2 5 inch hard drives with brackets External Connectors Audio Back panel Front panel eSATA Network Parallel Serial USB Front panel Back panel Video System Board Connectors PCI 2 3 Mini tower two connectors for line in microphone and line out two front panel connectors for headphones and microphone one 7 pin connector one RJ 45 connector one 25 pin connector bidirectional one 9 pin connector 16550C compatible two connectors six connectors one 15 hole VGA connector one 20 pin DisplayPort connector data width maximum 32 bits two 120 pin connectors Desktop two 120 pin connectors Small form factor one 120 pin connector PCI Express x1 data width maximum one PCI Express lane Mini tower one 36 pin connector Desktop not applicable Small form factor not applicable P
25. ir electrical outlets Press and hold the power button while the system is unplugged to ground the system board Remove the cover CAUTI ON Before touching anything inside your computer ground yourself by touching an unpainted metal surface such as the metal at the back of the computer While you work periodically touch an unpainted metal surface to dissipate static electricity which could harm internal components Recommended Tools The procedures in this document may require the following tools e Small flat blade screwdriver e Phillips screwdriver e Small plastic scribe e Flash BIOS update program CD see the Dell Support website at support dell com Turning Off Your Computer EN CAUTI ON To avoid losing data save and close all open files and exit all open programs before you turn off your computer 1 Shut down the operating system In Windows Vista Click Start then click the arrow in the lower right corner of the Start menu as shown below and then click Shut Down In Windows XP Click Start Turn Off Computer Turn Off The computer turns off after the operating system shutdown process is complete 2 Ensure that the computer and all attached devices are turned off If your computer and attached devices did not automatically turn off when you shut down your operating system press and hold the power button for about 6 seconds to turn them off After Working Inside Your Computer After you complete a
26. m Setup Dell OptiPlex 780 Service Manual Mini Tower Desktop and Small Form Factor Boot Menu Navigation Keystrokes Entering System Setup System Setup Simulation System Setup Menu Options Boot Menu Press lt F12 gt when the Dell logo appears to initiate a one time boot menu with a list of the valid boot devices for the system The options listed are Internal HDD CD DVD CD RW Drive Onboard NIC BIOS Setup Diagnostics This menu is useful when you are attempting to boot to a particular device or to bring up the diagnostics for the system Using the boot menu does not make any changes to the boot order stored in the BIOS Navigation Keystrokes Use the following keystrokes to navigate the System Setup screens a E T T Entering System Setup Your computer offers the following BIOS and System Setup options e Bring up a one time boot menu by pressing lt F12 gt e Access System Setup by pressing lt F2 gt lt F12 gt Menu Press lt F12 gt when the Dell logo appears to initiate a one time boot menu with a list of the valid boot devices for the computer Diagnostics and Enter Setup options are also included in this menu The devices listed on the boot menu depend on the bootable devices installed in the computer This menu is useful when you are attempting to boot to a particular device or to bring up the diagnostics for the computer Making changes in the boot menu does not make any changes to
27. ny replacement procedure ensure you connect any external devices cards and cables before turning on your computer 1 Replace the cover CAUTION To connect a network cable first plug the cable into the network device and then plug it into the computer Connect any telephone or network cables to your computer Connect your computer and all attached devices to their electrical outlets Turn on your computer Verify that the computer works correctly by running the Dell Diagnostics See Dell Diagnostics U AUN Back to Contents Page Back to Contents Page Removing and Replacing Parts Dell OptiPlex 780 Service Manual Desktop Cover Optical Drive Primary Hard Drive Secondary Hard Drive Optional Flo Drive Optional Riser Cage Expansion Card Standard Back Plate Memory Heat Sink and Processor Power Supply Coin Cell Battery Fan 1O Panel System Board Back to Contents Page Back to Contents Page Technical Specifications Processor Controls and Lights Memory Network Expansion Bus Audio Video Power System Information System Board Connectors Cards Physical Drives Environmental External Connectors K NOTE Offerings may vary by region For more information regarding the configuration of your computer click Start Help and Support and select the option to view information about your computer NOTE Unless otherwise stated the specificati
28. ons are identical for mini tower desktop and small form factor computers Processor Type Intel Core 2 Duo FSB up to 1333 MHz Intel Core 2 Quad FSB up to 1333 MHz Intel Pentium Dual Core FSB up to 1066 MHz Intel Celeron FSB up to 800 MHz way set associative writeback SRAM Capacity 1 GB 2 GB or 4 GB non ECC Integrated Intel graphics media accelerator X4500 up to 256 MB shared video memory total system memory greater than 512 MB Discrete PCI Express x16 slot supports either a PCI Express card or a DVI add on card for dual monitor support Network Integrated Intel integrated network interface card capable of 10 100 1000 Mb s communication System Information piosenpwrawy SA Expansion Bus Expansion Bus Bus type PGI 2 3 PCI Express 2 0 SATA 1 0A and 2 0 eSATA USB 2 0 Bus speed PCI 133 MB s PCI Express X1 slot bidirectional speed 250 MB s x16 slot bidirectional speed 8 GB s SATA 1 5 Gbps and 3 0 Gbps eSATA 3 0 Gbps USB 480 Mbps Mini tower up to two full height cards Desktop without riser card up to two low profile cards with riser card up to two full height Small form factor cards one low profile card PCI Express x1 Mini tower one full height card Desktop none Small form factor none PCI Express x16 Mini tower one full height card Desktop without riser one low profile card with riser one full height card Small form factor one low prof
29. operating systems will not complete installation when the maximum CPUID Function supported is greater than 3 This option is disabled by default This option allows you to optimize your hard drives performance and acoustic noise level based on your personal preferences e Bypass default Do nothing needed for older drives e Quiet The drive is slower but quieter e Suggested Allow drive manufacturer to select the mode e Performance The drive is faster but possibly noisier Virtualization Support Virtualization VT for Direct I O Trusted Execution Security Administrative Password System Passw This Option specifies whether a Virtual Machine Monitor VMM can utilize the additional hardware capabilities provided by Intel Virtualization Technology Enable Intel Virtualization Technology This option is disabled by default Enables or disables the Virtual Machine Monitor VMM from utilizing the additional hardware capabilities provided by Intel Virtualization technology for direct 1 O Enable Intel Virtualization Technology for Direct I O This option is disabled by default Field specifies whether a Measured Virtual Machine MVMM can utilize the additional hardware capabilities provided by Intel Trusted Execution Technology The TPM Virtualization Technology and Virtualization Technology for Direct I O must be enable to use this feature Enable Intel Trusted Execution Technology This option is dis
30. procedures in Before Working Inside Your Computer 2 Loosen the captive screws on each side of the heat sink 3 Rotate the heat sink upwards eM it rik l eb u iLL _ tec coco eee ree ee Pie Ci K 4 Lift the heat sink and remove it from the computer 5 Open the processor cover by sliding the release lever from under the cover latch on the socket Then pull the lever back to release the processor cover 6 Lift the processor cover 7 Remove the processor from the computer CAUTION When replacing the processor do not touch any of the pins inside the socket or allow any objects to fall on the pins in the socket Replacing the Heat Sink and Processor To replace the heat sink and processor perform the above steps in reverse order Back to Contents Page Back to Contents Page Coin Cell Battery Dell OptiPlex 780 Service Manual Desktop AX WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Coin Cell Battery 1 Follow the procedures in Before Working Inside Your Computer 2 Pull the retention clip away from the coin cell battery 3 Remove the coin cell battery from the system Replacing the Coin Cell Battery To replace the coin cell battery perform the above steps in r
31. r computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Power Supply Follow the procedures in Before Working Inside Your Computer Remove the optical drive Remove the secondary hard drive if present Remove the hard drive Disconnect the main power connector from the system board UW BWNE 6 Disconnect the processor power connector from the system board 7 Release the processor power connector cable from routing guides under the system board 8 Remove the screws that secure the power supply to the back of the chassis tse t e o o o HO H Seta e a a a e a s i i D O E E e a me Suaccscuaau a Te BEBE SERRE hie OG a anes oF oh p Ania SNTE 5 9 Press the power supply release latch at the bottom of the chassis and then slide the power supply towards the front of the computer 10 Lift the power supply up and away from the computer the Power Supply ing To replace the power supply perform the above steps in reverse order Replac Back to Contents Page Back to Contents Page Fan Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regul
32. roblem or that can help you identify a faulty component or assembly The following table lists the beep codes that may be generated during the POST Most beep codes indicate a fatal error that prevents the computer from completing the boot routine until the indicated condition is corrected Microprocessor register failure NVRAM read write failure ROM BIOS checksum failure 1 2 1 1 2 2 1 2 3 1 3 1 3 1 through 2 4 4 Memory not being properly identified or used 3 1 1 3 1 2 3 1 4 3 2 2 3 2 4 3 3 1 3 3 2 3 3 4 3 4 1 3 4 2 Master interrupt mask register failure Slave DMA register failure Master DMA register failure 3 4 3 Search for video ROM failure aa _ cachetestfolure Diagnostic Lights To help troubleshoot a problem your computer has four lights labeled 1 2 3 and 4 on the bank panel When the computer starts normally the lights flash before turning off If the computer malfunctions the sequence of the lights help to identify the problem K NOTE After the computer completes POST all four lights turn off before booting to the operating system Light Pattern Problem Description Suggested Resolution ogo The computer is in a e Plug the computer into a working electrical outlet t Neal NA Wa normal off condition or e If the problem persists contact Dell a possible pre BlOS failure has occurred The diagnostic lights are not lit after the computer successfully boots to the operating system
33. s desktop Then shut down your computer and try again 3 When the boot device list appears highlight Boot to Utility Partition and press lt Enter gt 4 When the Dell Diagnostics Main Menu appears select the test that you want to run Starting the Dell Diagnostics From the Drivers and Utilities Disc 1 Insert the Drivers and Utilities disc 2 Shut down and restart the computer When the DELL logo appears press lt F12 gt immediately If you wait too long and the Windows logo appears continue to wait until you see the Windows desktop Then shut down your computer and try again NOTE The next steps change the boot sequence for one time only On the next startup the computer boots according to the devices specified in the system setup program 3 When the boot device list appears highlight Onboard or USB CD ROM Drive and press lt Enter gt 4 Select the Boot from CD ROM option from the menu that appears and press lt Enter gt 5 Type 1 to start the menu and press lt Enter gt to proceed 6 Select Run the 32 Bit Dell Diagnostics from the numbered list If multiple versions are listed select the version appropriate for your computer 7 When the Dell Diagnostics Main Menu appears select the test you want to run Dell Diagnostics Main Menu 1 After the Dell Diagnostics loads and the Main Menu screen appears click the button for the option you want Express Performs a quick test of devices This test typically takes
34. the riser cage handle and lift the riser cage up and away from the computer 5 On the riser cage rotate the card retention latch upward 6 Gently pull the card release latch on the riser board away from the card and ease the card out of its connector Replacing the Riser Cage To replace the riser cage perform the above steps in reverse order Back to Contents Page Back to Contents Page Standard Back Plate Dell OptiPlex 780 Service Manual Desktop A WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Standard Back Plate 1 Follow the procedures in Before Working Inside Your Computer 2 Remove the riser cage 3 Gently lift the standard back plate and remove from the computer Replacing the Standard Black Plate To replace the standard black plate perform the above steps in reverse order Back to Contents Page Back to Contents Page Heat Sink and Processor Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Heat Sink and Processor 1 Follow the
35. to Contents Page Secondary Hard Drive Optional Dell OptiPlex 780 Service Manual Desktop A WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Secondary Hard Drive Optional 1 Follow the procedures in Before Working Inside Your Computer 2 Remove the optical drive from the computer 3 Disconnect the hard drive data cable 4 Disconnect the hard drive power cable 5 Pull up on the release latch and then slide the hard drive towards the back of the computer 6 Lift the hard drive and remove it from the computer Replacing the Secondary Hard Drive To replace the secondary hard drive perform the above steps in reverse order Back to Contents Page Back to Contents Page Riser Cage Dell OptiPlex 780 Service Manual Desktop WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance Removing the Riser Cage 1 Follow the procedures in Before Working Inside Your Computer 2 Disconnect the PS 2 serial port cable from the system board 3 Pivot the riser cage handle to an upright position 4 Gently pull
36. wn October 2012 Rev A02 Working on Your Computer Dell OptiPlex 780 Service Manual Desktop Before Working Inside Your Computer Recommended Tools Turning Off Your Computer After Working Inside Your Computer Before Working Inside Your Computer Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your personal safety Unless otherwise noted each procedure included in this document assumes that the following conditions exist AN A A e You have performed the steps in Working on Your Computer e You have read the safety information that shipped with your computer e A component can be replaced or if purchased separately installed by performing the removal procedure in reverse order WARNING Before working inside your computer read the safety information that shipped with your computer For additional safety best practices information see the Regulatory Compliance Homepage at www dell com regulatory_compliance CAUTION Many repairs may only be done by a certified service technician You should only perform troubleshooting and simple repairs as authorized in your product documentation or as directed by the online or telephone service and support team Damage due to servicing that is not authorized by Dell is not covered by your warranty Read and follow the safety instructions that came with the product CAUTION To avoid electrostatic discharge

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