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Hmm. Afaik, Tiger lacks the required drivers for nVidia Tesla G8x/G9x. Support was introduced in Leopard 10.5 in which you'll find the necessary NV50 & associated GeForce kexts/drivers. So, no support for the GeForce 8600M of that Inspiron 1520 in 10.4.11. https://dortania.github.io/GPU-Buyers-Guide/legacy-gpus/legacy-nvidia.html#geforce-8-8xxx-series But I'm probably in the wrong given that, according to what I read, MBP3,1 with GeForce 8600M did indeed ship with Tiger 10.4.9. nVidia drivers in Tiger 10.4.11 (as seen in Pacifist with 10.4.11 combo update (Intel) dmg): nVidia drivers in Leopard 10.5.8 (as seen in Pacifist with 10.5.8 combo update dmg): If you lookup in SysProfiler/SysInfo->Software->Extensions of Leopard 10.5.8 (or later), you'll see the nVidia drivers that get loaded. You can then compare with what loads in Tiger. Given the years that have passed since Tiger, you're very unlikely to obtain support for this ancien release and, at OSXL, we only ever supported systems running Snow Leopard or later. This being said, you may find this MBP3,1 IOReg extract useful in troubleshooting your machine; but it was taken in Leopard 10.5.8, not Tiger... MacBookPro3_1-ioreg.zip