Dell OptiPlex GX1p - Manual (Page 55)

Optional Stand Removal (Midsize Chassis): Dell™ OptiPlex™ GX1p
To remove the optional stand, follow these steps:
1. Place the right side of the computer on a flat work surface.
2. Unscrew the optional-stand screw.
Use your fingers or a wide flat-blade screwdriver to unscrew the optional-stand screw.
3. Pull the stand away from the computer.
Disengage the 3 orientation nubs that position and help secure the stand to the computer.