Remove these 4 silver 6mm Philips #2 screws to release the top power supply.

Peel off this cardboard that is glued to the power supply cover.

Unplug the large plug at each end of the power supply and the smaller fan wire. You can now remove the top power supply.

Remove these 4 silver 8mm Philips #2 screws from the lower power supply and unplug the small wire. You can now remove the power supply and the card it is sitting on.