Things You'll Need:
- Phillips-head screwdriver
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Step 1
Open your computer case. Depending on the case, you may or may not need to use a screwdriver.
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Step 2
Disconnect all the power cords from the dead power supply from the computer's devices. The power supply is a cube located in the upper back part of the tower case with a bundle of cables come from it that connect to all devices that require power. It is the box that that houses the power switch. You will have to disconnect plugs from your motherboard, hard drives, CD/DVD/floppy drives and any other devices that the bundle is connected to. Take note of each device that you disconnect, so you are sure to reconnect it later.
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Step 3
Unscrew the power supply; usually there are 4 small screws holding it in place. Set the screws aside.
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Step 4
Slide the power supply away from the back of the case and remove it from the computer. Depending on how crowded your case is and the size of your power supply, you may have to remove other devices to get the power supply out.
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Step 5
Install the new power supply. Slide the new power supply into the computer and use the screws you removed earlier to lock it in place. Next, connect your motherboard and other devices to the power cables. Finally, close the case.
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Step 6
Start up the computer and ensure that all devices are receiving power. All case fans should be spinning, and your peripheral devices should be on.
