[ubuntu] messed up LINUX

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http://ubuntuforums.org – Hi all! I think I've made a mess on my LINUX computer. It was freezed so I tried to restart it, however then the mouse wasn't working so I tried some strange combination of keys like ctrl alt f4, but not sure about it, and it all went black like if I just had a terminal interface. If I try startx it goes to a kde interface but then I'm not able to shut it down and if I log off or try to rebooth it simply goes back to the all black interface that looks like a terminal. How can I go back to my GNOME interface? Any help? :confused: (Hardware)