[64 bit] Screen display unresponsive after left off for random time

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http://ubuntuforums.org – Hi there, I'm hoping someone can help me out. As the title states, if i close my laptop lid or lock the screen or even just leave the display to timeout on its own, the next time i go to use the computer i either get a black screen with my mouse pointer visible or i get my background wallpaper with no panel or anything on it. I am forced to hard reboot. Any ideas? Thanks *edit I am running ubuntu 12.04 unity 64bit (Hardware)