Also while you have it opened up check for leaking or bulging capacitors. I had somewhat the same problems with a Dell SX270. Originally thought it was the power supply too but it turns out it had a total of 8 leaking and/or bulging capacitors once i opened it up. New motherboard fixed the problem. For me, the error didn't tell me anything then I was able to get in a run an extended diagnostic on it and thats when it gave me the error I needed about temperature being to low or high which is caused by the capacitors. Good luck and hope you can get the problem fixed.
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Never grow a wishbone where your backbone ought to be.
~ Clementine Paddleford
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