@blackhawk
Sorry, maybe I should have been more precise. Just follow the directions from the thread I linked. I followed it last night and was able to install ML no problem.
For your convenience here the part I am referring to (thx to Colton328):
Part 1: Setting up the UniBeast Drive
1. Insert your UniBeast Flash Drive into a working Mac. Maybe your MacBook Pro, working Lion installation, etc.
2. Run this command in terminal to unhide files "defaults write com.apple.finder AppleShowAllFiles 1" (copy and paste that into terminal and hit enter)
3. Force Finder to quit. You can do this in activity monitor. It will automatically restart.
4. Open Finder and navigate to your UniBeast Drive
5. Navigate to System/Library/Extensions
6. MAKE A BACKUP OF the kext "ATI6000Controller.kext" and then DELETE it.
Part 2: Booting from your UniBeast Drive
1. Boot from your UniBeast drive like you usually would. Use the command "GraphicsEnabler=No" in order to boot into Mountain Lion Installer
2. Install Mountain Lion as you usually would
3. After installation, bootup Mountain Lion by booting into your flash drive and then booting into ML, using the command "GraphicsEnabler=No"
4. Copy the ATI6000Controller.kext kext to your new desktop
5. Run KextBeast (Download:
http://www.tonymacx86.com/downloads.php?do=cat&id=3)
6. Reboot
Good Luck,
Ice