That was my doing as i removed nvidia-dkms and replaced it with nvidia in the packages list. I wasn’t sure what i was doing but when i tried running an test install it said nvidia-dkms was missing just like the packages ipw2100 and ipw2200 so i changed it. The main thing I was trying to do was to get the nvidia 520.xx series drivers booting off the live ISO. Im just unsure how it all works so i was winging it.
Edit: EndeavourOS did install but still booted to black screen so the OP switched to the onboard amdgpu drivers which works. I was trying to get the OP to install the 525.xx beta drivers which are in the AUR. On the nvidia site they are now released but obviously not in the Arch repo yet as they probably have to go through testing. I only see another newer 520.xx series driver in testing in the Arch testing repo.
Edit2: I suggested the OP try the nvidia-beta-dkms version
Edit3: Still not sure if it’s a driver issue or some other hardware issue with this RTX 4090 card?