Rotate the power supply so that the main fan enclosure faces to the right, with the motherboard mounting pegs on top.

Remove the two #2 Phillips 7mm screws on the side of the power supply.

Remove two more #2 Phillips 7mm screws on the opposite side of the power supply.

Rotate the power supply so the fan faces towards you, and remove a fifth #2 Phillips 7mm screw from just under the foam pad.