Dell OptiPlex XE2 (Mid 2013) - Manual (Page 30)

4. Remove the screws that secure the system board to the computer and slide the system board towards the front of
the computer.
5. 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. Connect the cables to the system board.
4. Install the:
a) processor
b) heat-sink assembly
c) expansion card(s)
d) memory
e) cover
5. Follow the procedures in After Working Inside Your Computer .
30