Originally Posted by exoxfire
Well good's news people, I find what it's causing the problem: Is the GeForceGLDriver.bundle, more Specific the file GeForceGLDriver on it. Make a right click on GeForceGLDriver.bundle and select "Show package content" and go to: "Contents->MacOS>GeForceGLDriver".
The good new is that i get my card fully working and in theory have to works with all the Fermi cards that have Problems.
Here's some notes:
-For get full resolution you have to make a backup of your files "GeForce.kext & GeForceGLDriver.bundle" and install the same Lion 10.7.4 kexts restart mountain lion and when mountain lion start again choose your best resolution(If you don't can start Mountain Lion after installing the kexts, start in safe mode on chameleon Bootloader: -v -x). With the Lion kexts you don't have Full Graphics Acceleration So you have to install the next kexts after you change the best resolution.
-After you choose the best resolution Install this modify version of the Mountain Lion "GeForce.kext & GeForceGLDriver.bundle" edited by me with Full Graphics Acceleration:
http://cl.ly/3A432l3W253t
Please leave your comments if this work for you.
PD: Everything works fine for me on my GTS 450 1GB GDDR5
Update: I try playing StarCraft II: Wings of Liberty and works ok, and iTunes and VLC Works fine too.