have you tried removing the graphics card and see if it still crashes? Although its probably not the card, without it drawing power the psu will have less stress. But I think you should just take the psu to a shop to have it tested. If that doesn't work then then only other thing it could be would be the motherboard. The voltage differences are pretty normal.
I did try removing the graphics card and using onboard graphics but for some reason windows wouldn't load all the way like that. I swapped out the power supply with one I had in another computer and it runs like a champ. Going to send in my power supply and get a new working one hopefully. Thanks for the help.