[ubuntu] Ubuntu 12.10 no longer boot after driver installation

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http://ubuntuforums.org – Hey guys, I have Ubuntu 12.10 installed, I have a ATI Radeon HD 5770 graphics card installed. I wanted to install the drivers because I recently install steam for Linux, and I wanted to make use of my graphics card's performance. However, I installed the drivers (Downloaded from their website) and I can no longer boot into Ubuntu; I get a blank screen. Any help will be thank on restoring and fixing this issue. (Hardware)