PC boots up but keyboard and mouse don't work

[King kong Bunde]

I just plugged in my second computer and it boots up normally but when I get to the login screen the keyboard and mouse don't do anything. The backlighting on my keyboard works but no matter what let's I press nothing works and I can't get into my PC. I've tried a second keyboard and I've check that bot keyboards work on different devices. Im starting to run out of ways to troubleshoot this issue since I can't even get into my PC. Please help

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