How to troubleshoot your broken PSU

There’s a good chance that your PC’s power supply is malfunctioning if it won’t turn on. As we’ve outlined in previous videos, there are several signs that your power supply may be faulty. But today, I’ll explain how to do some troubleshooting in order to figure out what went wrong and fix it if possible.

First, let’s make sure this is not just a power outage.

  1. Test if the issue is related to your power source or a blown fuse by plugging the computer into an outlet you know has power
  2. Confirm that the power cable is not the issue by swaping it out for another known working one
  3. All power cables must be checked for tightness
  4. Check the power switch at the back of the PSU to ensure that it is switched on
  5. Inspect the PSU externally for signs of wear or damage

If your computer does not turn on after you’ve gone through these steps, there may be an issue with the power supply. To test it out you can do what is called a Jumper Test to see if it works properly.

  1. Disconnect the power supply from both the motherboard and your power cable. Detach the 20-pin connector of your modular power supply for later use.
  2. Bend a metal paperclip into a U-shape
  3. With the power cord unplugged and the power supply switch in the O position, use one end of a paperclip to poke into pins labeled 1 (green) and 2 (black).
  4. Connect your PSU and flip the power switch. If your PC’s fan starts spinning, then you know that it’s getting power and has not completely failed. You may have some form of a partial failure, but there could also be another problem somewhere else or something wrong with the wiring in which case you’ll need to change out your PSU.

That’s all folks! Be sure to check out the blog of Velocity Micro for other helpful PC troubleshooting tips and tricks.

Leave a Comment