How to install a computer power supply unit

Yes No I need help. Locate the power supply unit of your computer. Unplug all of the power cables from the motherboard, hard drive or drives, and any other components that may have their own power supplies. Remove the 4 screws that hold the power supply in the computer's case.

Slowly and carefully lift out the old power supply unit, and set it in a safe place. Now fit the new PSU in the place of the old one. Next secure the new PSU with the 4 screws. From here, reconnect the cables as follows. Memorize or write down what cables are connected to what components before unplugging the old PSU it will be less confusing to connecting the new one and you'll make sure that no component is left unconnected after the installation.

Share this Article:. Thanks to all authors for creating a page that has been read times. 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. Remove the old power supply unit and cabling. Reconnect the internal wiring from the output of the power supply unit to the hardware components inside your computer case.

Plug in the input cable to the power supply. Connects the wall socket to the power supply. Power up the computer and test. Reasons To Change a Power Supply Unit There are only really two main reasons why you would need to replace the power supply unit in your computer, and if neither of these concerns you then the good news is that you can probably leave it alone.

PSUs that are not fit for purpose generally fall into two categories: The rated power output capacity of the PSU is too low Usually, this can happen if you are upgrading components in your computer that require more power.

The rated power output of a PSU is measured in Watts, and must be high enough to supply all the components within your computer. A classic example of when the power output of your PSU may suddenly become too low is if you are upgrading other components in your computer.

For example, installing a new graphics card that requires more power consumption can in many cases trigger the need to replace the existing power supply to a unit with a higher output capacity.

Unfortunately this can be the case with many pre-built computers, as cutting the budget spending on the PSU is very common. What Brands To Use One of our favorite recommended brands of power supplies is EVGA because we like their warranty on some of their products its up to 10 years!

Deending on the brand and Watt rating, prices can vary. Summary Changing the power supply unit in your computer is a relatively easy task that anyone can do — just follow the steps outlined in this post. Keep up the great work! Leave a Reply Cancel reply Your email address will not be published. Align them with the four screw holes at the back of the computer case circled in yellow below. Using a screw driver, secure the power supply unit to the case with screws:.

Now that the power supply is sitting pretty inside your computer case, let's move to the next step of a installing a PC power supply:.