Dell Dimension XPS T___ - Manual (Page 15)

To replace the computer cover and support beam on a desktop or mini tower chassis, perform the following steps:
1. Slip the beam ’s hinged tabs into their slots and lower the beam. Then place the lock tab into its fastener, and press down on the front end of
the beam until it snaps into position.
2. Position the cover on the chassis approximately one inch back. Slide the cover forward until it locks into place.
3. Tighten the cover-mounting thumbscrew on the back of the chassis.
Bezel
To remove the bezel, perform the following steps:
1. With the cover removed, press in the tabs along the top and side of the bezel.
2. Swing the bezel away from the chassis, disengage the hooks, and carefully pull the bezel away from the chassis.
Drive Cage
5 Hinged tabs (2)
1 Bezel
2 Tabs (3)
1 Drive cage
2 Screw
3 Drive-cage slots (6)