I recently purchased a 12 core mac pro for my consulting work from an ebay seller. I also procured a gt 750 Ti which I had flashed by macvidcards. I am using an Apricorn dual ssd to pci card for my boot disk and another ssd for my work data. Up until yesterday the machine worked quite well. When I went to wake it from sleep the monitor wouldn't wake up, well it would come on and say no signal. I tried rebooting to no avail. I plugged a different monitor using dvi rather than display port but no dice. I zapped pram and could see all the disks from my laptop (except for my data ssd). I tried safe mode but still couldn't get video. I am a pretty skilled hardware/software guy (I've gone the hackintosh route) but I am a little stymied. I haven't yet switched out the graphics card for the original gt 120. I am still concerned about not seeing the SSD.