Hey, I recently bought this GTX960. I previously had a GTX285 and with 10.9.4 (Mavericks). I walked through the steps of first updating to 10.10.3 (I did this last Friday, the date will be important, bear with me), then installing the latest NVIDIA web drivers (346.01.02f02). After, I made sure the driver manager had the NVIDIA web drivers selected (not the native OS drivers), turned off the system and put in the GTX960. It worked great! I left it up over the weekend, using it intermittently, then had to restart on Monday night. After restarting, the GTX960 was no longer outputting any video signal to the monitor. Swapping in the GTX285 worked fine. So what happened? I've switched DVI cables, tried a different monitor, put the GTX960 on a different PCIE port... I'm out of ideas. My only other thinking is that it may not be receiving enough power. Currently, I'm using the 6 to 8 pin adapter the card came with to convert the two 6 pin power cables into one 8 pin power cable for the card. When the card turns on it seems to run fine, but after getting to the point where the login screen should be up, the fans are no longer spinning. Any thoughts guys? Thanks in advance.