Re: Computer shuts down?
Hmmm, this could be a Power related problem. The weak link here seems to be the UPS and the Power Supply of the PC. Try changing these two things and it should be fine. Some UPS have replaceable batteries. Also check if there are any loose wires on the motherboard, UPS, etc.
Be careful here. This constant restarting could even lead to Hard Disk problems.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?