Dell OptiPlex 9010 (Mid 2012) - Manual (Page 36)

Installing the System Board
1. Align the system board to the port connectors on the rear 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:
a. processor
b. heat sink
c. expansion card(s)
d. memory
e. cover
5. Follow the procedures in After Working Inside Your Computer .
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