How to Install a Computer Power Supply

Level of difficulty: Intermediate

The Power Supply Unit (PSU) of a desktop computer is responsible for delivering the required electrical input from the AC socket to the components of the machine. The 110 to 220 volts electrical current generated from the electrical socket is converted into the required 5 to 12 volts used to power the different internal peripherals of the machine. At times, even the display monitor of the computer system is plugged into the PSU where it derives its required electricity for optimal function. In some instances, a broken PSU can lead to various computer system problems which is why learning how to replace it is a valuable skill.

Materials Needed:
- Desktop computer
- Power Supply Unit
- Screwdriver
- Antistatic wristband
Step 1
Since the power supply is installed inside the computer case, the first step is to make sure that the machine is disconnected from any electrical source. This will eliminate the risk of electric shock.
Step 2
Wear your antistatic wristband before proceeding. Take the screwdriver and carefully loosen and remove the screws of the casing cover. Once the casing is opened, you now have more room to put in the power supply.
Step 3
If installing a new power supply, proceed to step 7. When replacing an old power supply, go to the next step.
Step 4
Unplug first the cord which runs from the power supply onto the motherboard. Continue by carefully removing the connections to the hard drives, fans, floppy drives, optical drives, and other peripherals connected to the Power Supply Unit.
Step 5
Once all connections have been removed, carefully loosen the screws at the back of the Power Supply Unit. Make sure to remove them one at a time preferably in a crisscross manner. Maintain a firm grip of the Power Supply Unit to prevent it from falling on the motherboard or any other internal components.
Step 6
After removing all the screws, slowly pull out the Power Supply Unit making sure that the cords are not entangled with any computer component.
Step 7
Slide in the new Power Supply Unit into the computer casing. Make sure that the screw holes on the back of the Power Supply Unit are aligned to the guide holes on the back of the computer casing.
Step 8
Secure the Power Supply Unit by tightening the screws one at a time using the same crisscross pattern. Make sure that the installed Power Supply Unit and its cords are not hampering the operation of other internal components.
Step 9
Plug the cord from the Power Supply Unit intended for the socket on the motherboard. Connect the ground cord. Proceed by connecting the other devices to the Power Supply Unit. Make sure that all the connections are secure.
Step 10
Connect the Power Supply Unit to the electrical socket. Turn on the machine to make sure all peripherals are working properly.
Step 11
Shut down the machine and unplug it from the electrical source. Place the casing cover and put back all the necessary screws to make sure it is secured.

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