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[ubuntu] Freeze on black screen on boot, recovery will freeze too

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http://ubuntuforums.org – I recently was mucking around with my graphics drivers on Ubuntu 12.10 (I have a Radeon HD 6950 and I was getting borderless windows and no lenses). After I rebooted, now Ubuntu will show the logo and the orange dots for a minute, then the screen will go black and everything will freeze. Not even the NumLock key changes any lights on my keyboard, and Ctrl+Alt+Delete does nothing. When I run in recovery mode (by selecting Advanced Options for Ubuntu in the GRUB boot menu) I will get to the purple text Recovery Menu. If I Resume, I get the black screen described above. If I select Dpkg, then it (Hardware)