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computer problem, randomly won't start

The PSU is a 350W 'whisper' PSU, and the board is an ECS.

Sometimes it won't start for some reason I am trying to figure out.

When it won't work the computer refuses to power on, and if i walk away from it... hours later without touching anything it will power on and work perfectly passing stress tests (prime 95)

I monitored the PSU with a multimeter and the readings are solid, with like .1 difference under load

I tried taking everything apart and putting them together step by step but even then sometimes the computer won't power. So I walk away from it, come back later strip it down again to restart all over again and this time i was getting flawless results adding each piece back, and then ran software tests and so I felt it was perfect, so I goto mount the PSU and then it wont power again. I unmount it and still the same, I am guessing hours later from now it will work again.

Any ideas what can be the problem? I've tested the PSU on 2 other computers and it posts and works there, but did not give long attentive tests. One thing to note, the PSU when it does work, when you turn the PSU on it will take atleast 5-15secs for the power to go to the board before you can power the board on. Which I never noticed on any other PSU, already ordered an OCZ PSU, waiting on that.

Also noting the ECS is a cheap board and doesn't have a 4Pin 12V connection on the it.
 
My brother had the same problem... sometimes would post and other times it wouldn't. He swapped out his PSU too, but when I finally got to it and tested it, it blew up.... literally. Sounds like you've got a crappy power supply to me, good thing you've got another coming. (can't tell you why it works on other systems, although my brother's also worked on others)
 
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