Dell OPTIPLEX 990 Service Manual download pdf (Page 53)

8. Slide the system board towards the front of the computer.

9. Tilt the system board to 45–degrees, and then lift the system board out of

the computer.

Installing the System Board

1. Align the system board to the port connectors on the back of the chassis

and place the system board in the chassis.

2. Tighten the screws securing the system board to the chassis.

3. Connect the cables to the system board.

4. Install the

heatsink and processor

5. Install the

expansion card

6. Install the

front bezel

Install the

cover

8. Follow the procedures in

After Working Inside Your Computer

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Dell OPTIPLEX 990 Service Manual Page 53