|Did you make any changes or did anything happen to it between the last time it worked OK and the first time it didn't?|
Does the PSU fan spin for a second or two and that's all you get? If so, that's usually a bad power supply or motherboard. I know that doesn't really pin it down but you might want to swap in a known, working, compatible PSU and see if that makes any difference.
(It smells like rain and I see lightning but so far no rain. I'm tired of watering stuff everyday.)
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