Computer won't post

Hey there, one of my computers has died, the video card wasn't spinning, and the machine wouldnt post, I tried doing a bare bones start but still nothing. I swapped the video card to another pc and the fan spins, it posted and was outputting video. The other fans, cpu and case, in the other machine all work, so im at the point where im thinking the mb or cpu is the culprit, possibly the ps. Other than swapping more parts around, or trying a different ps, is there much else I can do besides buy new parts?
 
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