some more info is needed
is that a desktop or laptop
does it have a new cpu with a builtin gpu did you disable it in bios?
what are you using now noveau?
you should be able to login to icewm and do your work there as plasma 5 has issues with noveau (or however you spell that)
see this for more info https://en.opensuse.org/SDB:NVIDIA_drivers#Tumbleweed