[ubuntu] lost X-Windows on Ubuntu 11.10

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http://ubuntuforums.org – I was trying to follow directions on how to install the current nVidia driver, so I could learn how to program all those CUDA cores, and ended up with a blank purple screen. I can ^altF2 to get a terminal. The more info I find, the deeper in doodoo I seem to get. I think I've lost the nouveaux driver. When I typelshw -c video the output says display UNCLAIMED, and no driver is listed under "configuration". Anyone have any ideas?? :confused: Thanks! (Hardware)