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I've upgraded my graphics card from a Geforce gts 450 to the Asus Geforce GTX 660 ti. With the old graphics card the installation worked fine, but with the new one, the system reboots immediately after the mountain lion installtion is starting up. I've updated the bios, tried...

Thank you very much for these instructions. They helped a lot! :-) I've a Geforce GTS450 and the X79-Extreme4-M mainboard, which is the micro-atx version. I got Mountain Lion running using your DSDT. Sleep mode doesn't work perfectly. It goes to sleep successfully, but the graphics card...

Just wounder if you already have successfully installed mountain lion on this system? Thanks