Unless you have a power supply tester, and a spare known good power supply, the best thing to do is to take the tower to a shop and have the power supply tested. If the power supply tests "bad" then they could jump a known good power supply to the motherboard and see if the board is good.
I do these tests in my shop quite often. It takes about 20 minutes and the cost should be minimal, perhaps $25-$30.
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