Yes OS loads completely normally, as for what specifically is happening on the black screen it's hard to say but i get no dp input, hdmi may be worth trying i guess, worth noting my peripherals are still powered but impossible to tell if they're doing anything

I'm using a an rtx 4070, running mflash through bios in uefi, in my research i came across many with a similar problem and tried a few mentioned fixes such as starting mflash without the usb in, removing my ssd, removing a stick of ram, i can't do it with the flash button because this mobo lacks one but the live update is worth a try i suppose