Dell OptiPlex GX400 User's Guide download pdf (Page 41)

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.

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

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Dell OptiPlex GX400 User's Guide Page 41