Question Computer instantly turns back on after I shut it down.

Sep 20, 2020
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Every time I shut my pc down it instantly turns back on by itself, why? I've tried disabling fast startup, the setting "allow keyboard/mouse activate pc" and I've also disabled allow LAN to wake up pc aka Wake LAN I think, and it still turns back on when I shut it down. I don't have any other ideas what could cause it, maybe the monitor DVI D cable that I am using? Maybe the power supply?

PC specs:
i5 3470
RX 480 4GB
2x4 2133Mhz I think
500w PSU
Don't know what motherboard.
 

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