Dell XPS 720 (Mid 2007) - Manual (Page 153)

Removing and Installing Parts
153
10 Slide the power supply towards the front of the computer to free it from the securing tabs on the
computer chassis.
11 Slide the power supply toward the hard drive bay area, so that it will clear the protruding lip of the
chassis and lift the power supply from the computer.
1 power supply screws (4)
1