[ubuntu] Screen problem

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http://ubuntuforums.org – Hello. I recently updated my operating system, & now I'm having an issue with the display. I have a Dell Inspiron Mini. I'm not very technically inclined, so basic instruction would be appreciated. It boots up all right, but it seems like the display has been shifted up half a screen; that is, I can see the bottom half of the desktop in the top half of the screen while the bottom half of the screen is blank. The computer still responds to input, but you can't see any of the toolbars. Right clicking on the screen results in a window opening, but I can only see the bottom half of it &a (Hardware)