I have a newer 2013 Mac Pro. I run my main 30" monitor off of Thunderbolt. I also have a 55" Samsung running off of an HDMI port. When i start my computer it always thinks the HMDI monitor is the 'main' monitor. I go the System preference and set it up so the 30" is the front left monitor with the dock, but everytime I restart my computer, the 55" HDMI monitor is the front monitor with the dock. So when I start the computer I have to always go to the System preferences and have to...
HDMI and Thunderbolt priority
HDMI and Thunderbolt priority