Have you tried...
If you open a terminal with root privileges, you can enter console mode with the command "init 3", stopping X. There will be a prompt where you can log in as "su", giving the root password, then type "sax2 -r" to reconfigure your graphics card and screen. The command "init 5" starts X and gives you the desktop.
The sax2 X11 configuration window will allow you to open Options, Change, and pop-down menus if the sax2 automatic configuration isn't correct.