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How to Test a Power Supply Unit

If your system is having issues turning on, you can check if your power supply unit (PSU) is functioning properly by performing a test.

You will need a paper clip or a PSU jumper to perform this test.

IMPORTANT: Make sure that you jump the correct pins when testing your PSU. Jumping the incorrect pins may result in injury and damages to the PSU. Use the image below to see what pins you need to jump.

To test your PSU:

  1. For your safety, turn off the power supply by switching the I/O switch to "O" position and unplug the AC power cord.


  2. Unplug all cables from the PSU except for the 24-pin cable.

  3. Locate pin 4 and pin 5 on your 24-pin cable.
    • To find pin 4 and pin 5, count from the left with the clip facing up and the pins facing toward you.

  4. Bend your paper clip so the ends can be inserted into pin 4 and pin 5.
    • If you're using a PSU jumper, insert the ends into pin 4 and pin 5.


  5. Turn on the PSU; Plug in the AC power cord and set the I/O switch to the "I" position 


  6. Once turned on, the fan will spin up, which indicate the power supply is working and supplying power.


    NOTE: Some Enermax PSUs have a zero-RPM feature that results in the fan only spinning for a moment after the PSU is powered on. This still indicates that the PSU is functioning normally.