What was the third time that was the charm? I've just set my xbox one up with an ATX supply and it worked for two weeks or so, but just today does what you described, if I turn the PSU on manually the fan runs full speed, but if I connect it so the Xbox will turn on the PSU, which was working perfectly, it does nothing, it doesn't turn on the PSU, and it doesn't correctly make the powering on sound. I'm at a loss here.
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