Be careful not to touch any solder joints on the back of the power supply. Capacitors may be charged enough to give you a dangerous shock.

Remove the following four screws:

One 9.3 mm T10 coarse-threaded screw

One 25 mm T10 coarse-threaded screw

Two 22 mm fine-threaded screws

Pull the upper right and lower left corners of the power supply away from the rear case to dislodge the mounting posts attached to the power supply's corners.