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Dell 780 service manual Remove the screw that secures the power supply to the system board

Models: 780

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8. Remove the screw that secures the power supply to the system board.

9. Remove the screws that secure the power supply to the computer chassis.

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Dell 780 service manual Remove the screw that secures the power supply to the system board

Contents

Working on Your Computer Removing and Replacing Parts Specifications System Board Layout System Setup DiagnosticsNotes, Cautions, and Warnings Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageWorking on Your Computer Before Working Inside Your ComputerTurning Off Your Computer After Working Inside Your ComputerIn Windows Vista In Windows XP Click Start Turn Off Computer Turn OffRemoving and Replacing Parts Cover Drive Cage Optical Drive Wireless Local Area Network WLAN CardSystem Fan Heat Sink and Processor Intrusion Switch Coin-Cell Battery Internal Speaker Memory I/O Board Power SupplySpecifications ProcessorMemory VideoExternal Connectors System Board ConnectorsPower DrivesEnvironmental Back to Contents PageSystem Board Layout Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Back to Contents PageSystem Setup Entering System SetupSystem Setup Screen Dell OptiPlex 760 Ultra Small Form Factor-Service ManualSystem Setup Options Disable USB Internal default Read OnlySystem Configuration Enable defaultDisable AT PS/2 default EPP ECP No DMA ECP DMA ECP DMA COM1 COM3Front USB Rear Dual USB Rear Quad USB PCI slots Audio VideoDeactivate default Activate Clear Deactivate default Disable ActivatePower Management Power Off defaultMaintenance Image ServerStatic IP DNS Static IPBoot Sequence Option SettingsChanging the Boot Sequence for the Current Boot Enable F12 = Boot menu enabled by defaultBooting to a USB Device Password ProtectionChanging the Boot Sequence for Future Boots System PasswordAssigning a System Password Typing Your System PasswordDeleting or Changing an Existing System Password If Password Status is set to LockedAdministrator Password Assigning an Administrator PasswordOperating Your Computer With an Administrator Password Enabled Deleting or Changing an Existing Administrator PasswordJumper Settings Clearing Forgotten PasswordsDisabling a Forgotten Password and Setting a New Password Jumper SettingClearing CMOS Settings Back to Contents PagePage Diagnostics Dell DiagnosticsWhen to Use the Dell Diagnostics Starting the Dell Diagnostics From Your Hard DrivePower Button Light Codes Dell Diagnostics Main MenuPower Light State Off Blinking Amber Solid OptionBeep Codes Amber Blinking Green Solid GreenCode CauseDiagnostic Lights Problem Description Suggested ResolutionLight Pattern Back to Contents Page Repeat this process for each expansion card installed. If the computer1. Follow the procedures in Before Working Inside Your Computer CoverRemoving the Cover Dell OptiPlex 780 Ultra Small Form Factor-Service ManualReplacing the Cover Back to Contents PageTo replace the cover, perform the above steps in reverse order Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents Page1. Follow the procedures in Before Working Inside Your Computer CoverBack to Contents Page Replacing the CoverDrive Cage Removing the Drive CageDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents Page5. Disconnect the power and data cables from the optical drive 6. Flip over the drive cage and place it on the computer7. Disconnect the power and data cables from the hard drive 8. Remove the drive cage from the computerReplacing the Drive Cage Back to Contents PageTo replace the drive cage, perform the above steps in reverse order Optical Drive Removing the Optical DriveBack to Contents Page 1. Follow the procedures in Before Working Inside Your ComputerReplacing the Optical Drive 6. Remove the optical-drive bracket from the optical-drive assemblyWireless Local Area Network WLAN Card Removing the WLAN CardDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents Page7. Remove the WLAN card from the connector on the system board Replacing the WLAN Card Back to Contents PageTo replace the WLAN card, perform the above steps in reverse order System Fan Removing the System FanDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents Page6. Release the fan cable from its routing on the computer 7. Remove the screws that secure the fan to the computer chassisReplacing the System Fan Back to Contents Page8. Remove the system fan from the computer To replace the system fan, perform the above steps in reverse orderHeat Sink and Processor Removing the Heat Sink and ProcessorDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents Page6. Loosen the captive screws on the heat sink 7. Lift the heat sink out of the computer9. Open the processor cover Replacing the Heat Sink and Processor Back to Contents Page10. Remove the processor from the system board Intrusion Switch Removing the Intrusion SwitchDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageReplacing the Intrusion Switch Back to Contents PageCoin-Cell Battery Removing the Coin-Cell Battery6. Remove the heat sink and processor Dell OptiPlex 780 Ultra Small Form Factor-Service ManualReplacing the Coin-Cell Battery 9. Lift the coin-cell battery up and remove it from the system board9. Remove the wireless local area network card System BoardRemoving the System Board 5. Remove the heat sink and processor12. Disconnect the internal antenna cable 14. Remove the 7 mm hex screw from the system board 15. Remove the system board from the computerReplacing the System Board Back to Contents PageTo replace the system board, perform the above steps in reverse order Front Bezel Removing the Front BezelDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageReplacing the Front Bezel Back to Contents Page4. Rotate the front bezel away from the computer 5. Remove the front bezel from the computerHard Drive Removing the Hard DriveDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageReplacing the Hard Drive Back to Contents PageTo replace the hard drive, perform the above steps in reverse order Control Panel Removing the Control PanelDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents Page6. Remove the cable from the routing guides on the computer chassis 7. Remove the screw that secures the control panel to the computerReplacing the Control Panel Back to Contents Page8. Remove the control panel from the computer Internal Antenna Cable Removing the Internal Antenna CableDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PagePage Replacing the Internal Antenna Cable Back to Contents Page8. Remove the internal antenna cable from the computer Internal Speaker Removing the Internal SpeakerDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageReplacing the Internal Speaker Memory Removing the Memory ModulesDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageReplacing the Memory Modules Back to Contents PageTo replace the memory, perform the above steps in reverse order I/O Panel Removing the I/O PanelBack to Contents Page 1. Follow the procedures in Before Working Inside Your Computer7. Remove the I/O board by pulling it away from the computer Replacing the I/O Panel Back to Contents PageTo replace the I/O panel, perform the above steps in reverse order Power Supply Removing the Power Supply5. Remove the intrusion switch 6. Remove the heat sink and processor Dell OptiPlex 780 Ultra Small Form Factor-Service Manual8. Remove the screw that secures the power supply to the system board Replacing the Power Supply