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.