Kiwimoose You should be able to reach a TTY by pressing e.g. CTRL+ALT+F3. From there I'd first try another full update in case it was incomplete, with sudo eopkg up. If anything new gets installed, then I'd reboot and see if it works. If there are no updates, or the update didn't fix things, I'd do a sudo usysconf run -f to forcibly run all usysconf triggers. If there are no errors, reboot and see if it works now. If it still not works after these steps, I'd list the installed nvidia-packages with eopkg li | grep nvidia and then remove all the listed packages except for ones with -modaliases in the name (those are used for hardware detection and not part of the driver). Then I'd reboot and see if things work without the driver.
One possible issue is that your EFI partition is too small, and thus the kernel can't be properly updated, while the nvidia modules were, leading to a mismatch. That should show up as an error message when you run usysconf (see above)
