Yeah, I will agree with iceclock, you PS is probably not getting anywhere near the 500w advertised. It just exherts it self a little bit more than normal and shut's off.
It's a possibility, and many would consider it a likelihood. Never a good idea to go with a generic PSU. Why did you switch to the new PSU? If you or a friend have a spare PSU you could swap them and see if the problem persists. If not then you know what to do, and if not you can continue on to the next step in diagnosing the problem
most likely is ur problem.
hope u can return it, thats of generic evil quality
Also, have you done any OCing at all on your system? Instability could be causing the problem as well.
meh he has a generic junker providing inadequate power to the system. bad man
Agreed, but I figured I should offer a simple alternative just in case.