A day ago I was trying to turn on my pc, it would start to boot and at random times shut off. Up until then the PC has been solid. I’ve tested the PSU and I know there’s no problem with that (use a psu tester and the paper clip test). The problem I am now running into is I cannot get the to boot, whether it be shorting the power pins or using a power button. Any suggestions on how I should go about diagnostics from here?