When you install OS X on a normal PC with a nVidia 9600 GT, you can get in troubles. For example, when you move a window it’s content disappear (only it’s margin is showed) and to see the window content again you have to minimize the window and show it again. I think this is a video driver problem which doesn’t recognise the graphic card. But, since OS X Leopard have 9600 GT drivers you have only to fix some .kext and import a gfxstring

First of all reboot and boot up with -x option (safe mode prevents from loading specific drivers, so you won’t see any glich or window content disappear –NOTE– if you can’t surf on internet in safe mode you have to download the programs in normal mode (i know, it’s stressful but you have to do it)) go on /System/Library/Extensions and copy NVDANV50Hal.kext and NVDAResman.kext to your Desktop.

Now right click on NVDANV50Hal.kext and select Show Package Contents and then go in Contents.

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