Pc Turns on but no signal to monitor mouse or keyboard

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Hello, my pc turns on but no signal to monitor mouse or keyboard. When I tap on the keyboard it turns on for like 2 seconds and turns off.
SPECS:
Windows 11
I5 8400
1060 6gb
16gb ram
Motherboard biostar group h310mhd
Also if the cpu fan isn’t fully installed can that be the reason as 2 of the cpu cooler screws aren’t going in fully I’m not sure why
PLEASE HELP