I agree.
PSU are very sensitive, and power down at the slightest fluctuation.
Luckily its a feature, and they reset after a few seconds.
Ive had the same thing happen on an Enermax when I had a loose pin in a fan connector.
It's easy to test a PSU with a DMM anyway rather than buying new.
not sure how to do that ... should the PSU be plugged in or switched off?
would I be just testing the main connector (that goes on the mobo) or each molex too?
Have a look here.
Thats a 20 pin ATX.
24 pin ATX is this.....
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You may want to hook something up to it to create a load as well.
3 times with the same board! .. was it a manufacturing fault or something? How comes you stuck with the same board?