Well, the PSU you have I don't know that much about. What I do know is, 350 watts is really pushing the envelope. I would'nt be surprised if the PSU is locking up on you OR what it could be is something in the machine is not getting enough juice. That's really cutting it close man. Me personally, I would never go below 450-480 watts and that's only with a quality PSU. That's only my opinion though.