On boot, black screen says "Ubuntu 12.04.1 LTS [ubuntu name] tty1" and asks for login

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http://askubuntu.com – I am new to Linux, never used it before. I can follow instructions but don't know much about it. Tried searching for a solution to this but couldn't find one. I installed Ubuntu 12.04. It was working fine. Now when I boot up, I get BIOS splash screen, brief purple screen, then a completely black screen that says: "Ubuntu 12.04.1 LTS [Ubuntu name] tty1 [ubuntu name] login:" I can enter in my username and password, then it says: "last login: Mon Sep 10 18:37:03 EDT 2012 on tty1 Welcome to Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-30-generic x86_64) *Documentation: https://help.ubuntu.com/ 0 (HowTos)