Question Why does everything turn off when cpu is plugged in on first start?

Jun 1, 2019
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Just built a new pc. When I turn it on a get a c2 error which I’m pretty sure is normal. When I have my cpu plugged in, everything turns off within 3 seconds of everything turning on. When I unplug the cpu power cables everything stays running but when the cpu is plugged in, nothing stays on. Any suggestions?