That's crazy because I also had my GPU issue start after an update, and I've still not been able to resolve it.
So I've been for several months now just using the open-source drivers for Nvidia. This is my main computer, and I think I'm going to stick a new drive in and do a new Linux install on that drive and then I'll just mount the other 3 and I'll have all my files.

Which distro are you using again? And which GPU?