I feel your pain!
I am having a lot of problems with a multi-screen setup myself
Check if there is a backup of your xorg.conf file in /etc/X11/
Replace the current xorg.conf with the backup
Code:
sudo cp /etc/X11/name.of.backup /etc/X11/xorg.conf
If not, try
Code:
sudo nividia-xconfig
If you make any changes to xorg.conf you have to restart your display manager.
You can stop and start the display manager (for testing) by doing the following:
alt+F1 for terminal
alt+F8 should bring you back to graphical display
in terminal
for gnome
Code:
sudo /etc/init.d/gdm stop
sudo /etc/init.d/gdm start
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