Dell OptiPlex 990 (Early 2011) - Manual (Page 51)

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System Board
Removing The System Board
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Remove the expansion card .
5. Remove the heat sink and processor .
6. Disconnect all the cables connected to the system board.
7. Remove the screws that secure the system board to the computer.
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