[ubuntu] screen off after holding super/windows button

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http://ubuntuforums.org – hi all, i just installed ubuntu 1204 on my computer (intel Q9550 on Asus P5G41T-M LX with nivida gforce 9600GT). btw i'm new to linux installation was fine so far, but if i press and hold the windowsbutton i'll see an overlay of shortcuts for a splitsecond, and my display switches off immediately. no matter what i do, i cant get the display back. after that i can only switch the system off with my powerbutton, an then reboot it. i couldn't find anything related. (google an so on...) it doesn't seem to be a feature. i assume it's a bug. in system settings--hardware--additional (Hardware)