[ubuntu] Unity Crash on first Enter-Keystroke

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http://ubuntuforums.org – Hi, I'm a Ubuntu newbie. So please excuse if this is a silly question. I searched all over the forums and via Google, but I can't find an answer for my Problem: Whenever I started my Computer with Ubuntu the very first Enter keystroke crashes Unity desktop and dropping me back to the login screen: power on computer Ubuntu 11.10 starts Unity loads to right desktop (don't need login choice) using eg. firefox with mouse, browsing file explorer with mouse -> no problem open console with ctrl alt t -> no problem then just hit "enter" in console -> Unitiy crash (black screen and (Hardware)