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Question Computer automatically turns on when plugged then turns off after 3 seconds.

Jun 26, 2020
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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?
 

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