[ubuntu] Display problem at startup

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http://ubuntuforums.org – Hi, this is my first post here.. I recently installed Ubuntu on my Sony Vaio laptop. Originally it started up and displayed correctly, however I tried to extend the desktop on to my second monitor. I think I may have adjusted the display drivers or something and now when Ubuntu starts, after the loading screen, the display goes black. It flicks a few times but then stays black and nothing else happens. Windows starts and displays fine as before. As it's a fresh install I don't mind re-installing Ubuntu, but if there's a way I could get this install working with my second monitor that would be great. Is there a Linx equivalent for the Windows system restore or anything? Thanks Adam (Hardware)