5.Remove the four screws that secure the power supply at the rear of the chassis.
6.Press inward on the metal retainer inside the chassis and slide the power supply toward the front of the chassis and lift it out of the chassis as shown.
7.Install the new power supply into the chassis so that the screw holes in the power supply align with those in the chassis.
Note: Use only the screws provided with the new power supply.
8.Install and tighten the four screws that secure the power supply.