I forgot to plug the 12V ATX 4 pin connector to the motherboard and I made a mistake of plugging it in when I the motherboard is already on. After that the computer just automatically turns on when the PSU is plugged in then turns off seconds later. I already tried using a different power supply but same results. Also reseated the CMOS battery and Ram sticks nothing changed. I'm thinking that the motherboard is dead but is there a chance that the processor is also damaged?