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We get alot of pc's with the same problem (we have a repair department in our company). First you need to check a few things:
1 - Make sure your mainboard doesn't touch the skin of your case directly, for example, sometimes the outer skin of an usb port touches the skin of the computer case -> can cause reboots or shut down
2 - Check all fans. Make sure the CPU fan is mounted so that it overlaps all edges of your CPU, i've seen fans that where mounted badly on top of the CPU causing the CPU to overheat. If you have an active core temperature fan, make sure the rpm increases when the core temperature rises, in most cases you can check this in your BIOS. Make sure the power suply fan works and runs at it's maximum RPM.
3 - Make sure all add-on cards (PCI, AGP, ETC.....) are pushed down onto the mainboard as far as they can and are fastened with a screw.
In 90% of the shut down problems the solution is in one of the above, if not the problem is, a) RAM memory b) CPU c) mainboard d) power suply, and i would start with replacing the power suply.
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