Replacing a PSU is not a complicated procedure to perform and we have included a few very handy tips that help make the process a simple task, even for a beginner.

Safety Advice

Even when disconnected from the mains, the internal capacitors inside a power supply unit can still hold a lethal charge so it is important to never dismantle a PSU or insert any objects such as a screwdriver into any gaps in the outer casing of the unit.

Equipment Needed

To follow the steps in this article you will need a Philips screwdriver, a digital camera, and an anti-static wristband.

1) Unplug PC & Remove Side Panel

The first step is to disconnect the PC from the mains, lay the computer on its side on a steady surface and remove the main side panel so that you have a clear view of the internal components (the side panel will usually slide off once two small screws at the back have been removed).

2) Photograph The Inside Of The PC

This is a very useful tip for any beginner as it will provide a point of reference when you come to fit a new power supply unit. With the flash enabled to take a clear photo of the internal layout of the PC so that you can clearly see the position of all wires and connectors inside (if necessary take several photos from different angles). You can browse to know more about the best wireless router.

3) Attach Anti-static Wristband and unplug connectors

The next step will involve you unplugging the various connectors from the PSU and therefore we recommend wearing an antistatic wristband to protect components from ESD (electrostatic discharge). You will be able to easily identify the PSU because it will be a square box located at the top of the case with a rather untidy mass of wires protruding from it.

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4) Remove PSU.

Now that the PSU is no longer connected to any other component inside the PC it can be easily be removed by unscrewing the four Philips screws located on the back of the computer at the top – there will be one for each corner of the PSU (N.B. Keep the screws handy as you will need these to fit the new PSU). You will not be able to remove the old PSU.

5) Install Replacement PSU

Your new PSU should be the same physical dimensions and therefore all you will need to do is position it into the case at the same orientation as the previous PSU, make sure it is line up with the four screw holes on the rear of the PC and then using the four screws you removed in step 3, lock the new PSU into place.

6) Connect PSU to All Components

Now that you have your new PSU in place it will be necessary to connect all of the wires to their respective components in exactly the same manner that the previous PSU was connected.

Once you have connected the PSU to all components, you may find that you have several small connectors which are spare – if this is the case don’t worry, this is exactly what they are, i.e. spare. The best thing to do is use a cable tidy or elastic band to neaten any spare wires and keep them out the way of other components inside the computer.

7) Final System Check

Before you re-fit the side of the PC case double check every connection from the PSU to make sure all of the connections are secure (the largest connector which enters the motherboard can be quite stiff and may require a firm push to make sure it is sitting flush).

8) Power On

Ensure the power switch on the PSU is set to the on position then attach the kettle lead to the mains and power on your computer. If all goes well the system should power on normally and begin loading your operating system. Check that all devices are working properly (DVD Drive, Card Readers, etc). If the system does not power on correctly you will need to unplug the PC from the mains, remove the case and double check every connection again – the chances are you have missed something (remember to use the photos you took earlier for reference).

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