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#11
Don't forget that it could be just poorly written software. If only Skyrim is crashing then that is a possibility. Check their forums to see if others are having the same problem.
The best way for regular folks to test a power supply is with a multimeter. I connect it to a spare 12v connector from the PS and then watch the readings constantly as I use the PC. The voltage should be at least 12v and be rock steady, give or take a tenth of a volt. Anything more than that is a problem.