Hi moarfish.
I have the same MB, but my video card is nvidia. I Have lion 10.7.5 Installed and working perfect.
I've tried to upgrade to 10.8.3. Literally impossible. (I also tried with 10.8.0. The same thing.)
I do not understand why, but when it comes to the installation screen the computer restarts.
I bought the ML build the usb with unibeast, so good but do not want to run the installer. With -v read all kext and when finish, screen go black and reboot after 3 or 5 seconds
I also tried running the upgrade of the ML from Lion. Wrong. I run the app, therefore selected another HD for ML, copy some things, rebooted and reloaded Lion doing nothing.
I've tried everything I've found, but nothing. Any idea?
Thanks