Dell OptiPlex GX1p - Manual (Page 79)

Front Bezel Removal (Mini Tower Chassis): Dell™ OptiPlex™ GX1p
To remove the front bezel, follow these steps:
1. Press the tab release marked with the icon.
2. Tilt the bezel away from the chassis.
3. Disengage the 2 retaining hooks at the bottom of the bezel, and pull the bezel away from the chassis.