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It could be the PSU, motherboard or CPU.
When you take everyhtign off and just leave these 3 components, what happens? does the CPU fan spin and stop or does it continue to spin? do you get any beeps?
The chances are you are going to have to cross test the components with other ones that you know will work
I have tried removing all the connections from the motherboard but the PSU, chassis fan, and connections to the power on button. Same result as before.