Feb 9, 2009

I am going to assume that it is overheating, or drawing too much power. I would suggest that you first download software to tell you what your core temp is, and watch it until it shuts off. That will give you a good idea. Many computers shut off at a certain temperature to save your parts, but not all.

Other than that, as I said, it might be a power issue, although I would assume that the computer would just bog itself down rather than turn off. What are you running in your system? And what is your PSU?