[ddouglass]

I think you guys are missing something. His system is re-booting not shutting down. If there was a heat problem with the processor the system would shutdown.

Windows is getting a fatal error of some kind and is re-starting. To find out what the error is right click on "My Computer", go to properties (last item), change to the "Advanced" tab and look at "Startup and Recovery" settings. Uncheck the "Automatically Restart" box.

Then the next time it errors out when you try to load a disc, you should get an error message...probably a blue screen with the culprit listed. It could still be a power supply problem that may be affecting your drives, but this should tell you/us more than we know at this point.