[ubuntu] login error when logging into ubuntu

view story

http://ubuntuforums.org – When I login to ubuntu, it shows a black screen, and takes me back to the login screen. the password is right, and there is no error message showing up. I am running 12.04 LTS. i renamed the user's home folder, so that may have done it. i am getting an error in the terminal saying that "no... (Hardware)