My PC turned off randomly the other day. The power cable going into the PSU had been slowly pulling out and I guess it pulled out too far that it shut down. I pushed it back in and tried turning on my PC, but it turned off immediately after turning on (fans spun, lights flicked on for a second). I played with the internal cablings of my PC but the problem still occurred. So I've taken the PSU completely out of my PC and tried turning it on manually by following this tutorial https://www.howtogeek.com/172933/how-can-i-test-my-computers-power-supply/ . The PSU's fan turns on for a second then turns off, so I've limited the problem to the PSU hence why I'm on this forum. Anyone able to help or give any advice?