Motherboard won't shut down

I don’t know if something was enabled or disabled during a kernel update, but I can’t completely shut down the computer.

I installed Windows with another drive (yes, I know it’s sacrilege) and tested it. The command to restart and shut down works without problems. I’ve tried with Manjaro, Cachy, Fedora, Mint, U/Kbuntu… but it shuts down in Linux.

Honestly, I don’t know what to do. I’ve tried poweroff -f and other combinations, but I can’t find a way to shut it down. It freezes. Only the CPU and CPU cooler fans (12 cm) keep running.

Is it possessed?

Thanks.