A variety of factors could prevent your system from turning on, so it’s important to isolate the problem. This test that will allow you to determine if your Corsair power supply is functional.
Required Materials: Paper Clip
Step 1: Shut off the PSU by flipping the switch on the back to the "O" symbol
Step 2: Unplug all cables from the PSU except for the main AC cable and the 24-pin cable.
Step 3: Locate pin 4 and pin 5 on your 24-pin cable. Count to this from the left, with the clip facing up.
Step 4: Bend the paper clip so that the ends of are inserted into pin 4 and 5.
Step 5: Turn on the PSU by flipping the switch on the back to the "|" symbol
If the PSU fan turns as a result of this test, this indicates it is functional. Note that many Corsair PSUs have a zero-RPM feature which results in the fan only spinning for a moment after power-on, which still indicates a “pass.”
You can also perform the same test using a PSU jumper instead of a paper clip.