So i bought a corsair 600w PSU off ebay for a second PC I'm putting together out of spare parts from previous builds. But when all hooked up i press the power button and the fans whirl and the lights come on for a second. I've tried it in the current PC I'm on also with the same result. So I'm guessing the PSU is duff, but wanted to know if there was any other possibility anyone else might know of before i ship it back to the seller?