[ubuntu netbook remix] display problem! help!

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http://ubuntuforums.org – i have been running ubuntu 9.10 netbook remix on my dell mini 10 for a couple of weeks and i love it. my brother used my computer and somehow the display got all screwed up. its slow and not right. when i start the computer up i get an error saying ubuntu is running in low graphic mode and i cant change anything in the display icon. the display says its 1024 and my netbook is 1366. and it wont let me change it back what do i do? any help would be greatly appreciated. (Hardware)