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@chez_jay
This is a failure long before OS boot process. Probably electrical problem one way or another. Could be just a loose connection. Try again with as much as you can unplugged, e.g. memory, drives, video card (use motherboard video out instead). Look for crap in slots that could cause short circuits. You might get a LED/beep code that you can look up in motherboard manual.
You can also test power supply on its own, unconnected from motherboard - you'll need to short 2 pins.