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Dell 780 service manual Clearing CMOS Settings, Back to Contents Page

Models: 780

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Clearing CMOS Settings

1.Follow the procedures in Working on Your Computer.

2.Remove the computer cover.

3.Locate the 2-pin password jumper (PSWD) on the system board, and remove the jumper to clear the password. See Password Protection.

4.Replace the computer cover.

5.Connect your computer and monitor to electrical outlets, and turn them on.

6.After the Microsoft® Windows® desktop appears on your computer, shut down your computer.

7.Turn off the monitor and disconnect it from the electrical outlet.

8.Disconnect the computer power cable from the electrical outlet, and press the power button to ground the system board.

9.Open the computer cover.

10.Locate the 2-pin password jumper on the system board and attach the jumper to reenable the password feature.

11.Replace the computer cover.

CAUTION: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.

12. Connect your computer and devices to electrical outlets, and turn them on.

NOTE: This procedure enables the password feature. When you enter system setup (see Entering System Setup), both system and administrator password options appear as Not Set—meaning that the password feature is enabled but no password is assigned.

13. Assign a new system and/or administrator password.

Clearing CMOS Settings

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.

1.Follow the procedures in Working on Your Computer.

2.Remove the cover.

3.Reset the current CMOS settings:

a.Locate the password (PSWD) and CMOS (RTCRST) jumpers on the system board (see Password Protection).

b.Remove the password jumper plug from its pins.

c.Place the password jumper plug on the RTCRST pins and wait approximately 5 seconds.

d.Remove the jumper plug from the RTCRST pins and place it back on the password pins.

4.Replace the computer cover.

CAUTION: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.

5. Connect your computer and devices to electrical outlets, and turn them on.

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Dell 780 service manual Clearing CMOS Settings, Back to Contents Page

Contents

System Board Layout System Setup Diagnostics Working on Your Computer Removing and Replacing Parts SpecificationsNotes, Cautions, and Warnings Before Working Inside Your Computer Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Working on Your ComputerIn Windows XP Click Start Turn Off Computer Turn Off Turning Off Your ComputerAfter Working Inside Your Computer In Windows VistaInternal Speaker Memory I/O Board Power Supply Removing and Replacing PartsCover Drive Cage Optical Drive Wireless Local Area Network WLAN Card System Fan Heat Sink and Processor Intrusion Switch Coin-Cell BatteryVideo SpecificationsProcessor MemoryDrives External ConnectorsSystem Board Connectors PowerBack to Contents Page EnvironmentalBack to Contents Page System Board LayoutDell OptiPlex 780 Ultra Small Form Factor-Service Manual Back to Contents PageDell OptiPlex 760 Ultra Small Form Factor-Service Manual System SetupEntering System Setup System Setup ScreenEnable default System Setup OptionsDisable USB Internal default Read Only System ConfigurationVideo Disable AT PS/2 default EPP ECP No DMA ECP DMA ECP DMACOM1 COM3 Front USB Rear Dual USB Rear Quad USB PCI slots AudioPower Off default Deactivate default Activate ClearDeactivate default Disable Activate Power ManagementStatic IP MaintenanceImage Server Static IP DNSEnable F12 = Boot menu enabled by default Boot SequenceOption Settings Changing the Boot Sequence for the Current BootSystem Password Booting to a USB DevicePassword Protection Changing the Boot Sequence for Future BootsIf Password Status is set to Locked Assigning a System PasswordTyping Your System Password Deleting or Changing an Existing System PasswordDeleting or Changing an Existing Administrator Password Administrator PasswordAssigning an Administrator Password Operating Your Computer With an Administrator Password EnabledJumper Setting Jumper SettingsClearing Forgotten Passwords Disabling a Forgotten Password and Setting a New PasswordBack to Contents Page Clearing CMOS SettingsPage Starting the Dell Diagnostics From Your Hard Drive DiagnosticsDell Diagnostics When to Use the Dell DiagnosticsOption Power Button Light CodesDell Diagnostics Main Menu Power Light State Off Blinking Amber SolidCause Beep CodesAmber Blinking Green Solid Green CodeProblem Description Suggested Resolution Diagnostic LightsLight Pattern Repeat this process for each expansion card installed. If the computer Back to Contents PageDell OptiPlex 780 Ultra Small Form Factor-Service Manual 1. Follow the procedures in Before Working Inside Your ComputerCover Removing the CoverBack to Contents Page Replacing the CoverTo replace the cover, perform the above steps in reverse order Cover Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page 1. Follow the procedures in Before Working Inside Your ComputerReplacing the Cover Back to Contents PageBack to Contents Page Drive CageRemoving the Drive Cage Dell OptiPlex 780 Ultra Small Form Factor-Service Manual6. Flip over the drive cage and place it on the computer 5. Disconnect the power and data cables from the optical drive8. Remove the drive cage from the computer 7. Disconnect the power and data cables from the hard driveBack to Contents Page Replacing the Drive CageTo replace the drive cage, perform the above steps in reverse order 1. Follow the procedures in Before Working Inside Your Computer Optical DriveRemoving the Optical Drive Back to Contents Page6. Remove the optical-drive bracket from the optical-drive assembly Replacing the Optical DriveBack to Contents Page Wireless Local Area Network WLAN CardRemoving the WLAN Card Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Remove the WLAN card from the connector on the system board Back to Contents Page Replacing the WLAN CardTo replace the WLAN card, perform the above steps in reverse order Back to Contents Page System FanRemoving the System Fan Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Remove the screws that secure the fan to the computer chassis 6. Release the fan cable from its routing on the computerTo replace the system fan, perform the above steps in reverse order Replacing the System FanBack to Contents Page 8. Remove the system fan from the computerBack to Contents Page Heat Sink and ProcessorRemoving the Heat Sink and Processor Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Lift the heat sink out of the computer 6. Loosen the captive screws on the heat sink9. Open the processor cover Back to Contents Page Replacing the Heat Sink and Processor10. Remove the processor from the system board Back to Contents Page Intrusion SwitchRemoving the Intrusion Switch Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Replacing the Intrusion SwitchDell OptiPlex 780 Ultra Small Form Factor-Service Manual Coin-Cell BatteryRemoving the Coin-Cell Battery 6. Remove the heat sink and processor9. Lift the coin-cell battery up and remove it from the system board Replacing the Coin-Cell Battery5. Remove the heat sink and processor 9. Remove the wireless local area network cardSystem Board Removing the System Board12. Disconnect the internal antenna cable 15. Remove the system board from the computer 14. Remove the 7 mm hex screw from the system boardBack to Contents Page Replacing the System BoardTo replace the system board, perform the above steps in reverse order Back to Contents Page Front BezelRemoving the Front Bezel Dell OptiPlex 780 Ultra Small Form Factor-Service Manual5. Remove the front bezel from the computer Replacing the Front BezelBack to Contents Page 4. Rotate the front bezel away from the computerBack to Contents Page Hard DriveRemoving the Hard Drive Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Replacing the Hard DriveTo replace the hard drive, perform the above steps in reverse order Back to Contents Page Control PanelRemoving the Control Panel Dell OptiPlex 780 Ultra Small Form Factor-Service Manual7. Remove the screw that secures the control panel to the computer 6. Remove the cable from the routing guides on the computer chassisBack to Contents Page Replacing the Control Panel8. Remove the control panel from the computer Back to Contents Page Internal Antenna CableRemoving the Internal Antenna Cable Dell OptiPlex 780 Ultra Small Form Factor-Service ManualPage Back to Contents Page Replacing the Internal Antenna Cable8. Remove the internal antenna cable from the computer Back to Contents Page Internal SpeakerRemoving the Internal Speaker Dell OptiPlex 780 Ultra Small Form Factor-Service ManualReplacing the Internal Speaker Back to Contents Page MemoryRemoving the Memory Modules Dell OptiPlex 780 Ultra Small Form Factor-Service ManualBack to Contents Page Replacing the Memory ModulesTo replace the memory, perform the above steps in reverse order 1. Follow the procedures in Before Working Inside Your Computer I/O PanelRemoving the I/O Panel Back to Contents Page7. Remove the I/O board by pulling it away from the computer Back to Contents Page Replacing the I/O PanelTo replace the I/O panel, perform the above steps in reverse order Dell OptiPlex 780 Ultra Small Form Factor-Service Manual Power SupplyRemoving the Power Supply 5. Remove the intrusion switch 6. Remove the heat sink and processor8. Remove the screw that secures the power supply to the system board Replacing the Power Supply