Sounds like it's getting hot instead of there not being enough power. When it's on, are the fans inside spinning? (on the CPU itself)
Also, I've seen people put their computers into little tight cabinets that cover up all the vents- I'm assuming you have air easily going in and out?
To get a better idea on what's going on, just download this: UBCD for Windows Run build, burn it to a CD, then boot from that CD and run the various tests you want.





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