Okay, so I've got this monitor at home, and can not get it to work with my mid 2014 15-inch rMBP with dual graphics. I have tried it connected to both the OWC Thunderbolt 2 station, and the Caldigit Thunderbolt 2 station and get the same result - black screen on both the laptop and the Samsung, and have to hard shut down the machine. The only way I was able to get the Samsung recognized was connecting it directly to the HDMI port on the Mac, and using gfxCardStatus set to Dedicated graphics only. Funny thing is, the monitor works absolutely fine with my 13" rMBP, from both Thunderbolt 2 docks. Any thoughts on what next step I can take to troubleshoot?