I have a 2009 Mac Pro flashed to 5,1 with 2 Xeon 5690, 64gb ram , Ge Force 680 4 gb flashed w/ Mac boot screen. I am running 10.11.2, and the latest nvidia Mac driver. There is one cal digit USB 3.0 esata pic-e cardconnected to the OS X boot drive.y When the dvi cable is connected to the DVI-I port, the boot screen stops half way through, and quits. The Windows 10 drive boots normally off the same port while holding down the option key. The OS X drive boots normally off the DVI-D port. Any thoughts?