Question PC turns on and then off in a millisecond ? (I suspect the mobo)

Oct 24, 2021
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Hello. I am facing a difficulty. I had an old pc of mine, that i wanna give to my brother. I disassembled it to just the mobo and psu + cpu. With, or without the cpu the PSU turns on for just a spin then turns off, so its not the cpu. I saw some bent pins, could that be the problem? Keep in mind it does the same thing WITH or without the cpu. I start the pc using jumping the pins.
THE SPECS:
Be Quiet Pure Power 350W (testing PSU)
ASROCK B75 Pro 3-M
Intel Core i5 3570 4-core

Thank you for any assistance.