System Board Layout System Setup Diagnostics
Working on Your Computer Removing and Replacing Parts Specifications
Notes, Cautions, and Warnings
Working on Your Computer
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
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Before Working Inside Your Computer
In Windows Vista
Turning Off Your Computer
After Working Inside Your Computer
In Windows XP Click Start Turn Off Computer Turn Off
System Fan Heat Sink and Processor Intrusion Switch Coin-Cell Battery
Removing and Replacing Parts
Cover Drive Cage Optical Drive Wireless Local Area Network WLAN Card
Internal Speaker Memory I/O Board Power Supply
Memory
Specifications
Processor
Video
Power
External Connectors
System Board Connectors
Drives
Environmental
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System Board Layout
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
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System Setup Screen
System Setup
Entering System Setup
Dell OptiPlex 760 Ultra Small Form Factor-Service Manual
System Configuration
System Setup Options
Disable USB Internal default Read Only
Enable default
Front USB Rear Dual USB Rear Quad USB PCI slots Audio
Disable AT PS/2 default EPP ECP No DMA ECP DMA ECP DMA
COM1 COM3
Video
Power Management
Deactivate default Activate Clear
Deactivate default Disable Activate
Power Off default
Static IP DNS
Maintenance
Image Server
Static IP
Changing the Boot Sequence for the Current Boot
Boot Sequence
Option Settings
Enable F12 = Boot menu enabled by default
Changing the Boot Sequence for Future Boots
Booting to a USB Device
Password Protection
System Password
Deleting or Changing an Existing System Password
Assigning a System Password
Typing Your System Password
If Password Status is set to Locked
Operating Your Computer With an Administrator Password Enabled
Administrator Password
Assigning an Administrator Password
Deleting or Changing an Existing Administrator Password
Disabling a Forgotten Password and Setting a New Password
Jumper Settings
Clearing Forgotten Passwords
Jumper Setting
Clearing CMOS Settings
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Page
When to Use the Dell Diagnostics
Diagnostics
Dell Diagnostics
Starting the Dell Diagnostics From Your Hard Drive
Power Light State Off Blinking Amber Solid
Power Button Light Codes
Dell Diagnostics Main Menu
Option
Code
Beep Codes
Amber Blinking Green Solid Green
Cause
Problem Description Suggested Resolution
Diagnostic Lights
Light Pattern
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Repeat this process for each expansion card installed. If the computer
Removing the Cover
1. Follow the procedures in Before Working Inside Your Computer
Cover
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
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Replacing the Cover
To replace the cover, perform the above steps in reverse order
1. Follow the procedures in Before Working Inside Your Computer
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
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Cover
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Replacing the Cover
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Drive Cage
Removing the Drive Cage
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5. Disconnect the power and data cables from the optical drive
6. Flip over the drive cage and place it on the computer
7. Disconnect the power and data cables from the hard drive
8. Remove the drive cage from the computer
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Replacing the Drive Cage
To replace the drive cage, perform the above steps in reverse order
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Optical Drive
Removing the Optical Drive
1. Follow the procedures in Before Working Inside Your Computer
Replacing the Optical Drive
6. Remove the optical-drive bracket from the optical-drive assembly
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Wireless Local Area Network WLAN Card
Removing the WLAN Card
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7. Remove the WLAN card from the connector on the system board
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Replacing the WLAN Card
To replace the WLAN card, perform the above steps in reverse order
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
System Fan
Removing the System Fan
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6. Release the fan cable from its routing on the computer
7. Remove the screws that secure the fan to the computer chassis
8. Remove the system fan from the computer
Replacing the System Fan
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To replace the system fan, perform the above steps in reverse order
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Heat Sink and Processor
Removing the Heat Sink and Processor
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6. Loosen the captive screws on the heat sink
7. Lift the heat sink out of the computer
9. Open the processor cover
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Replacing the Heat Sink and Processor
10. Remove the processor from the system board
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Intrusion Switch
Removing the Intrusion Switch
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Replacing the Intrusion Switch
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6. Remove the heat sink and processor
Coin-Cell Battery
Removing the Coin-Cell Battery
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Replacing the Coin-Cell Battery
9. Lift the coin-cell battery up and remove it from the system board
Removing the System Board
9. Remove the wireless local area network card
System Board
5. Remove the heat sink and processor
12. Disconnect the internal antenna cable
14. Remove the 7 mm hex screw from the system board
15. Remove the system board from the computer
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Replacing the System Board
To replace the system board, perform the above steps in reverse order
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Front Bezel
Removing the Front Bezel
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4. Rotate the front bezel away from the computer
Replacing the Front Bezel
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5. Remove the front bezel from the computer
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Hard Drive
Removing the Hard Drive
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Replacing the Hard Drive
To replace the hard drive, perform the above steps in reverse order
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Control Panel
Removing the Control Panel
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6. Remove the cable from the routing guides on the computer chassis
7. Remove the screw that secures the control panel to the computer
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Replacing the Control Panel
8. Remove the control panel from the computer
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Internal Antenna Cable
Removing the Internal Antenna Cable
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Replacing the Internal Antenna Cable
8. Remove the internal antenna cable from the computer
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Internal Speaker
Removing the Internal Speaker
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Replacing the Internal Speaker
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
Memory
Removing the Memory Modules
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Replacing the Memory Modules
To replace the memory, perform the above steps in reverse order
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I/O Panel
Removing the I/O Panel
1. Follow the procedures in Before Working Inside Your Computer
7. Remove the I/O board by pulling it away from the computer
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Replacing the I/O Panel
To replace the I/O panel, perform the above steps in reverse order
5. Remove the intrusion switch 6. Remove the heat sink and processor
Power Supply
Removing the Power Supply
Dell OptiPlex 780 Ultra Small Form Factor-Service Manual
8. Remove the screw that secures the power supply to the system board
Replacing the Power Supply