Dell XPS/Dimension XPS Gen 2 - Manual (Page 27)

5. Close the computer cover halfway and pull the front panel away from the computer.
Replacing the Front Panel
To replace the front panel, perform the removal procedure in reverse.
Drive Door
Removing the Drive Door
1. Open the drive door.
2. Unsnap the top bracket hinge and pull the top of the drive door outward, away from the computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in your Owner's Manual.