Usually you can pres control alt and F1 thru F6 and get into the terminal screen.
then you can log in and do a ps ax to see the processes, kill the proc. number (very first numbers on the left).
you may have to do
ps ax |more
to see all processes.
btw kill the proc related to your GUI.
Also once you get into the terminal screen you can re config with this command;
sudo dpkg-reconfigure xserver-xorg
sudo dpkg-reconfigure -phigh xserver-xorg
(or man xorg.conf ) to read the manual
To take the GUI from starting permanently do;
update-rc.d -f gdm remove (or kdm or xdm whichever youre using)
to put it back into startup;
update-rc.d -f gdm default (or kdm or xdm instead of gdm)
BTW2 hopefully someone with Linux experience will solve this problem. I am not an expert.
Last edited by matey; 18th August 2009 at 13:48.