Seen this twice on 2 different models, changed out the PSU, and all was OK.
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I'm having this exact problem with my Hp pavilion Media Center m7350N desktop pc, which I've never had any problems with it since I got it, back when it first came out, until now, green light is in when power supply is plugged in but when the power button is pushed the light shuts off and the computer does nothing.
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