for a console-based editor, try pico for ease-of-use. also, you must restart X11 for changes to take place. try pressing CTRL+ALT+BackSpace to restart X so that it rereads the X11 config files. also, if that doesn't work, try pushing CTRL+ALT+PLUS-KEY to change the resolution size. if that screws up your screen, press CTRL+ALT+MINUS-KEY to return to the previous setting.
hope this helps!!!! :-)