[ubuntu] Can't Login to Ubuntu (Black screen asking user name and password)

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http://ubuntuforums.org – This happened after i installed the latest updates (from update manager) yesterday. I don't remember installing anything else than that. I use dual boot with windows home premium x64 + Ubuntu 12.04 with gnome 3.4 desktop environment. I installed gnome last week and i was enjoying the best experience i really ever had in linux with this set up. When i try to load Ubuntu, it shows standard Ubuntu loading screen and then a black command prompt comes up (with my computer's name and something like 'tty1' at the end) asking me my user name and password. I enter my user name and pass but it never ac (Hardware)