PC fans stay on after computer shut down

[deadmorrow]

Hey guys, I have recently assembled a custom PC and everything works fine and boots properly, however, the one issue I am experiencing is that the case fans and power supply fan stay on at a low RPM permanently. The only way to get them to shut off completely is by removing power from the power supply. Once the power to the PC has restored too after a full-power removal, the case fans act like they are trying to start to spin up but do not seem to get enough juice until the PC power button is pressed to boot the PC, then everything is fine. This is a strange issue so I am wondering if anyone has any insight or knowledge of the issue. Thank you so much for reading!
Gigabyte B550 DS3H
AMD Ryzen 5 3600
Corsair CX550M

[WaggishOhio383]

9 minutes ago, deadmorrow said:

Hey guys, I have recently assembled a custom PC and everything works fine and boots properly, however, the one issue I am experiencing is that the case fans and power supply fan stay on at a low RPM permanently. The only way to get them to shut off completely is by removing power from the power supply. Once the power to the PC has restored too after a full-power removal, the case fans act like they are trying to start to spin up but do not seem to get enough juice until the PC power button is pressed to boot the PC, then everything is fine. This is a strange issue so I am wondering if anyone has any insight or knowledge of the issue. Thank you so much for reading!
Gigabyte B550 DS3H
AMD Ryzen 5 3600
Corsair CX550M

I had the same problem with my PC when I first built it. Turn off fast startup in control panel and it should fix the problem.