Could you also add the configurations which mhwd made? Because without it, all systems will not boot and if the user removed the driver with mhwd, then the file mhwd-gpu.conf is empty anyway.
This creates a default xorg.conf file:
sudo nvidia-xconfig
That adds nouveau to the blacklist:
sudo echo -e "blacklist nouveau\nblacklist ttm\nblacklist drm_kms_helper\nblacklist drm" > /etc/modprobe.d/nvidia.conf
This loads the nvidia driver on boot:
sudo echo -e "nvidia\nnvidia-drm" > /etc/modules-load.d/nvida.conf