pc not turning off

Behavior: After attempting to shutdown (Windows 11 Pro) the OS seemingly shut down, all screens go to sleep (as in loosing signal as it is expected), but the PC will still run, all fans keep spinning and all lights are still on. Only by holding down the power button can I shot it down and to...

I just built this pc & all hardware is brand new except for the gpu specs- -i5 13600k -GIGABYTE Z790 AORUS Elite AX -corsair vengeance ddr5 -cooler master hyper 212 black rgb cpu cooler -corsair rm850x modular psu -seagate barracuda 2tb internal hdd -gtx 1660 super -chassis- be quiet! dark base...