How to Install Graphics Card Driver to Macbook Pro (Early 2008)

Hi @pho4me welcome to the community!

The best way for install the driver is trough RPM fusion the driver version 340.XX is supporting your card like you can see here, this driver is supported for fedora 30 and is not listed to fedora 31

http://us.download.nvidia.com/XFree86/Linux-x86/367.57/README/supportedchips.html

https://rpmfusion.org/

If you have fedora 30 you can install the driver accord this indications. (It is not complicate)

https://fedoramagazine.org/install-nvidia-gpu/

If you do be in fedora 30/31 you can read a bit more of information in rpmfusion

https://rpmfusion.org/Howto/NVIDIA#About_this_Howto

This post can be interesting to read too in your case

https://discussion.fedoraproject.org/t/fedora31-boot-options-not-going-to-latest-kernel-by-default/74054

Regards.