If you have no power except a small amount to the motherboard, then it's probably the power supply. I'd recommend borrowing an equivalent power supply that you know works to test it. If the other one does the same thing, then it's the motherboard.
Also, you could google "diagnostic cards". We've got one at the office that you plug in, and it gives a code for the problem it encounters. If it's the power supply, it won't work at all, but if it's the motherboard or something else, it'll tell you.
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Any sarcasm was intentional.
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