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.
To test your PSU:
- Shut off your PSU.
- Unplug all cables from the PSU except for the main AC cable and the 24-pin cable.
- 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.
- 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.
- Turn on the PSU.
- See if the PSU fan turns. If it does, the PSU is functioning normally.
- NOTE: Many Corsair 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.