Dell OptiPlex Gxi - Manual (Page 97)

Eject-, Power-, and Reset-Button Removal (Midsize Chassis): OptiPlex GXi
1. Lay the computer cover upside down on a flat work surface, with the back of the cover facing you.
2. To remove the 3.5-inch diskette-drive eject button, pull gently on the plastic part of the button until it comes free.
3. To remove the power button and the reset button, use a small screwdriver to push in the two or three plastic clips that secure the buttons to the computer cover.