Alright, here we go..
When I want to experiment with X, I go to text mode (TUI) and log in as root. You can reboot and select it, or run "init 2" as root. Once logged in to the command prompt, use "startx" to go GUI. When you log out, or press Ctrl-Alt-Backspace, you should be back at the shell prompt.
First thing to do is to make a copy of your original xorg.conf. Use whatever method you want, but command line:
cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
Next, open the original xorg.conf in a text editor and make the following changes.
In the first section, add one line:
Section "ServerLayout"
Identifier "X.org Configured"
InputDevice "Synaptics Touchpad" # <- ADD THIS LINE
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Then add this section below the original "Mouse0" InputDevice section:
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "SHMconfig" "true"
Option "HorizScrollDelta" "0"
Option "VertEdgeScroll" "1"
Option "TapButton1" "1"
EndSection
Save the file, exit to prompt and use startx to bring up the GUI. In a terminal, enter: (small L, not 1)
synclient -l
If you get this working, you can use synclient to turn off the touchpad, as well as making a number of other customizations.
If you need to restore the original configuration, just copy the xorg.conf.backup file to xorg.conf.