Well, I have saved my home directory and reinstalled it all again.
Still I dunno how to disable Xserver. Also, does unloading the kernel
module ("rmmod nvidia") apply to people who do not have older NVdia drivers installed? Or that would apply to the modules I should install with "rpm --justdb -Uhv NVIDIA_kernel*.rpm" and "rpm -Uhv NVIDIA_GLX*.rpm"?