You haven't mentioned what video drivers you're using? Also, what does System Profiler say about your graphics? hardware accelerated?
If you want to try the drivers from my Nvidia system, you can get them
here
If you do try them make sure you back up your current files just in case anything goes wrong
Code:
sudo -s
tar -cjpvf /System/Library/Extensions.tar.bz2 /System/Library/Extensions/
tar -cjpvf /System/Library/Frameworks/OpenGL.tar.bz2 /System/Library/Frameworks/OpenGL.framework/
exit
Also make sure to delete any video drivers you might have installed - natit, nvinject, etc - from your Extensions folder.
Assuming you downloaded and extracted the file in your Downloads folder you can do
Code:
cd ~/Downloads/nvidia_video
sudo -s
chown -R 0:0 *
chmod -R 644 *
cp -Rpf Extensions/* /System/Library/Extensions/
cp -Rf OpenGL.framework /System/Library/Frameworks/
rm -rf /System/Library/Caches
rm -rf /System/Library/Extensions/Caches
kextcache -a i386 -m /System/Library/Extensions.mkext /System/Library/Extensions/
Reboot, if you have any problems or if it doesn't help, you can boot with -s and recover your previous setup with
Code:
cd /System/Library/
rm -rf Caches Extensions Extensions.mkext
tar -xvf Extensions.tar.bz2
kextcache -a i386 -m Extensions.mkext Extensions/
cd Frameworks/
rm -rf OpenGL.framework
tar -xvf OpenGL.tar.bz2
reboot