...
$ sudo /bin/sh ./NVIDIA-Linux-x86_64-[version].run
Next: reboot (or just switch back to run level 5).
A reboot is optional
...
– but recommended
...
so you can verify that the graphical login (GDM) starts after a reboot.
If you cannot reboot now, just restart GDM by switching back to run level 5.
$ sudo reboot
or
$ sudo init 5
...