Quadro 600 works on Lion, but not Yosemite

[Zeke D]

Hello, all.

I have a cMP 1,1 flashed to 2,1. I run Yosemite on an SSD, and have Lion and Windows 7 on a WD red 1TB. I installed a Quadro 600, and it works perfectly on Windows 7 with the Quadro July 2016 drivers, and it works on Lion 10.7.5 with the default apple drivers. I did have the nVidia drivers installed on Yosemite when I was running a GeForce 210, but I used the nVidia manager to switch back to the apple drivers before swapping. The Q600 just won't output video under Yosemite. The nVidia manager recognized both cards when I was running them both, but still no video on the Q600. Any suggestions?

I doubt it matters, but my cMP is running 16GB RAM and a pair of 2.33Ghz quad-core Xeons.

 

[Zeke D]

I had a thought, and maybe the community can help. I'm a total EFI n00b. Do video cards have 32- & 64-bit EFI like the cMP 1,1 & 1,2? COuld this be causing issues with the Quadro 600 and Yosemite? If so, is there a decent site that can tell me if a video card is 32- or 64- bit EFI?

 

[CapnDavey]

Sorry I don't think there is a mac rom for the quadro 600 some cards like the HD4870 have 32 and 64 bit efi but most cards work on one or the other but not both. hope that helps