Dell OptiPlex 7020 (Mid 2014) - Manual (Page 24)

4. Release the power-switch cable from the chassis clips.
5. Press the clips on both side of the power switch to release it from the chassis and, slide to remove
the power switch along its cable from the computer.
Installing the Power Switch
1. Slide the power switch in through the front of the computer.
2. Secure the power-switch cable to the chassis.
3. Thread the power-switch cable into the chassis clips.
4. Connect the power-switch cable to the system board.
5. Install the:
a. optical drive
b. front bezel
c. cover
6. Follow the procedures in After Working Inside Your Computer.
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