Question Pc wont start

May 1, 2020
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My pc wont start. I think i blew the motherboard the other day not entirely certain. So i switched out motherboards put everything bsck perfectly and nothing started. Not even a twitch. I got a pc from a friend today we tested it earlier and it worked perfectly and again i switched everything out put all my stuff back in it and nothing again.
I checked the psu with another running pc and that works fine so i took out my graphics cards ram fan hard drives everything till it was just the motherboard plugged in with the cpu in it the motherboard shows that there is power but it will not turn on. I can not have blown three motherboards in the space of 2 days so i really dont understand it