multiple monitors

I can get one display to function but not two at the same time and never when dock is initially attached upon IPL. Even to get a single external display to function through the Surface dock, I have to boot the machine w/o any displays attached, then disconnect the dock, re-attach the external...

Booting up today, after having it shut down for two whole days, I couldn't get the monitor connected to the mDP port, using mDP->DP cable, to turn on. I also switched between the mDP port on the SP3 and then it worked fine. I have one monitor on each port, but now only half of that screen real...