I have a 2012, 6,2 Mac Mini server - i7, 16GB ram, 512 SSD. I connected my u3818dw monitor to the mini via mini DP to DP cable and it picks it up just fine. However, if I restart/shutdown, the mini will not boot. Screen stays blank and "searching for signal". I can boot fine using the HDMI to HDMI (mini to monitor). Only issue with that, is the resolution is capped at 1080p. Is this just a limitation of the Mini? I have to turn the machine off physically to reset it after it has booted with the monitor connected via DP. It will not output any signal either via DP or HDMI until it's turned off fully. Anyway around that?