Dell OptiPlex 7020 (Mid 2014) - Manual (Page 31)

4. Turn the hex screw counter clockwise and remove from the system board.
5. Remove the screws that secure the system board to the computer and slide the system board
towards the front of the computer.
6. Tilt the system board at 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 rear of the chassis and place the system board
in the chassis.
2. Tighten the screws securing the system board to the chassis.
3. Tighten the hex screw to the system board.
4. Connect the cables to the system board.
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