Generate an xorg.conf file

In order to generate xorg.conf you need to switch to a virtual console using the key combination CTRL + ALT + F1

Now execute the following commands:
sudo service gdm stop
- This command will stop the X.

sudo Xorg -configure
- this will generate the xorg.conf file in your home folder (the the proper location)

sudo mv ~/xorg.conf.new /etc/X11/xorg.conf
- move and rename the newly created xorg file to the correct location

sudo reboot
- to reboot the machine, and allow the changes to take effect.