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System Board

Dell™ OptiPlex™ GX400 Service Manual

  Removing the System Board

  Replacing the System Board

Removing the System Board

CAUTION: Before you perform this procedure, see "Precautionary Measures."

NOTICE: Before disconnecting a device from the computer or removing a component from the system board, verify that the standby power light on the system board has turned off. To locate this light, see "System Board Components."

1. Turn off the computer and devices, disconnect them from their electrical outlets, wait at least 5 seconds, and then remove the computer cover.
   
   
2. Lay the computer down on its right side.
   
   
3. Rotate the power supply away from the system board.
   
   
4. Remove the AGP card brace or AGP card clip.
   
   
5. Remove all expansion cards.
   
   
6. Remove all memory modules.
   
   
7. Remove the microprocessor airflow shroud.
   
   
8. Remove the microprocessor.
   
   
9. Remove the microprocessor cooling fan.
   
   
10. Disconnect all cables from the system board.
    
    
11. Slide all drive brackets partially out of the chassis.
    
    
12. Remove the screw that secures the system board to the bottom of the chassis.
    
    
13. Slide the system board toward the front of the chassis until it stops.
    
    

This unlocks the system board.

14. Lift the front of the system board.
    
    
15. Lift the system board out of the chassis at an angle.
    
    

Removing the System Board

Replacing the System Board

1. Lower the system board into the chassis at an angle, with the I/O panel connectors lowered into the chassis.
   
   
2. Carefully push down evenly on both sides of the system board to engage the grounding clips onto their respective chassis tabs.
   
   

NOTICE: Do not twist the system board as you position it in the chassis.

3. Slide the system board toward the rear of the chassis until it stops.
   
   

This locks the system board into position.

4. Replace the system board mounting screw.
   
   
5. Replace all components on the system board by performing step 3 through step 11 of "Removing the System Board" in reverse.
   
   
6. Set the jumpers on the new system board so that they are identical to those on the original board.
   
   
7. Replace the computer cover and restart the computer.
   
   
8. Run system setup to ensure that your settings are correct and that all system board components are correctly identified.
   
   
9. Run the Dell Diagnostics to verify that the computer is operating properly.
   
   

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