Cristoph: try this:
1) log out and press CTRL+ALT+F1 (so as to get to the command line).
2) Shut down the Xserver with either: sudo /etc/init.d/gdm stop
or (if you use KDM): sudo /etc/init.d/kdm stop
3) type: sudo rmmod nvidia sudo modprobe nvidia
4) Restart the Xserver: sudo /etc/init.d/gdm start
or (if you use KDM): sudo /etc/init.d/kdm start
Cristoph: try this:
1) log out and press CTRL+ALT+F1 (so as to get to the command line).
2) Shut down the Xserver with either:
sudo /etc/init.d/gdm stop
or (if you use KDM):
sudo /etc/init.d/kdm stop
3) type:
sudo rmmod nvidia
sudo modprobe nvidia
4) Restart the Xserver:
sudo /etc/init.d/gdm start
or (if you use KDM):
sudo /etc/init.d/kdm start