Dell OptiPlex Gxi - Manual (Page 102)

Control Panel Removal (Midsize Chassis): OptiPlex GXi
1. Remove the hard-disk drive bracket.
2. Disconnect the control panel cable from the PANEL connector on the system board.
3. Unscrew the mounting screw securing the control panel to the chassis.
4. Slide the control panel out of the hooks securing it to the chassis.
Note the routing of the control panel cable as you remove it from the chassis.