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I was trying to setup the desktop cube, and i used some gnome config thing and I checked a box, and the screen went white. any help would be appriciated, I know i wasn't very detailed, but thats all I remember.
Try pressing ctrl+alt+backspace. You might need to reconfigure X.org, though. I am guessing your graphics card can't handle compiz (desktop effects) and failing to activate it in most cases just returns to previous configuration...
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