Wind U100 External Monitor Problems

[Guest Olli120]

Hey,

i've installed Snow Leopard on my U100. I recently connected a beamer to the vga port and accidentally checked Mirror Displays. Now everytime when i connect a secondary Display the screen displays grey bars and i can only see the mouse cursor. I reinstalled Snow Leopard but it had no effect. And i can't uncheck it because when i unplug the beamer the pref-pane for the secondary display disappears. Is there any way to change this? Maybe through a "back door" like a .plist file or something?

Thank you,

Olli