Dell OptiPlex Gxi - Manual (Page 103)

Control Panel Removal (Low-Profile Chassis): OptiPlex GXi
1. Disconnect the control panel cable from the PANEL connector on the system board.
2. From the inside of the chassis, unscrew the mounting screw securing the control panel to the chassis.
3. Remove the control panel from the chassis.
When you reinstall the control panel, be sure to put the right side of the control panel behind the mounting tab.