Dell OptiPlex 960 (Late 2008) - Manual (Page 136)

Small Form Factor System Board Screws
Place the system board assembly that you just removed next to the replacement system board to ensure it is identical.
Replacing the System Board: Mini Tower, Desktop, and Small Form Factor
Computers
1. Gently align the board into the chassis and slide it toward the back of the computer.
2. Replace the screws on the system board.
3. Replace any components and cables that you removed from the system board.
4. Reconnect all cables to their connectors at the back of the computer.
5. Perform the procedure After Working on Your Computer .
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1 desktop system board 2 screws (11 — 7 for system board,
4 for heatsink)
1 small form factor system board 2 screws (8 — 4 for system board,
4 for heatsink)