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How to tell if your desktop computer power supply has failed

There may be a time when your desktop computer does not start up. There could be a few reasons why it does not start. The first thing that comes to mind is a failed power supply. Here's how to test your desktop power supply.

How to tell if your desktop computer power supply has failed

Living in Phoenix, we have one thing that really takes a toll on a desktop computer. No, it is not the heat, it is the dust. Since our environment here is so dry, we get a lot of dust.

How to clean the dust out of your computer

And since dust does conduct electricity, power supplies have a tendency to fail. Even if you routinely clean your desktop computer, they still only have a life span of around 3 to 5 years.

So, if when you press the power button your desktop computer does not start and there are no lights that light up, then you may have a failed power supply.

Now if you do not feel comfortable working around electricity or inside of your desktop computer, please contact a local computer technician.

How to test your desktop computer power supply

  1. Disconnect the power cord that comes from the outlet to the power supply.
  2. After you have disconnected the power cord, open up the case and touch any metal part of the power supply or case to discharge any remaining energy.
  3. Make a note or take pictures of all of the connections that lead from the power supply to the different devices. Once you have documented all of the power leads, then remove all of connections (SATA, Molex, PCI-e, ATX, MB, etc.) to all of the different devices and motherboard.
  4. Create a jumper from a piece of thin gauge wire or paper clip.
  5. Plug the power cord back in to the jack on the back of the power supply.
  6. Using the jumper you created, connect Pin 16 to either Pin 17 or Pin 18.
    Motherboard power supply connectior
    If the power supply fan starts to run, the power supply has output voltage and is good. If the power supply fan does not spin, it is time to replace it.

If your power supply has failed, make note of what type and how many connectors your existing power supply has.
Common desktop power supply connections
Also check the stated output of your existing power supply from the label on the side.

I also recommend that you use tape measure or ruler is measure the dimensions of the power supply, (Width x Height x Depth) as you will want to get as close as possible to these for the replacement power supply.

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