Dell OptiPlex 9020 All In One (Mid 2013) - Manual (Page 21)

c) VESA stand
7. Follow the procedures in After Working Inside Your Computer .
Removing the Intrusion Switch
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the:
a) VESA stand
b) back cover
c) VESA mount bracket
d) system-board shield
3. Disconnect the intrusion-switch cable from the connector on the system board. Unthread the cable from the
notches on the computer.
4. Remove the screws that secure the intrusion switch to the chassis. Lift the intrusion switch and remove it from the
computer.
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