Built a small project PC, used new components but old PSU (500W). Everything is plugged in and I wanted to ask what y'all thought in order to confirm or deny my suspicion that it is the PSU's fault.
Hit power button, lights and fans flash/spin-up for split second then everything dies. Will not go to POST.
Tried multiple outlets, tried unplugging things.
I think it is the PSU, the mobo and CPU were working yesterday in my current PC until I replaced them. RAM is working, and I can't think of any reason why a new DVDROM or HDD would not allow a PC to boot to POST.