Hi. I'm using a HP Z240, running 10.13.2. It works, but I only get video on 1 screen.
Im using 2 fullHD screen over DisplayPort. 1 works and the other one does not work, only during clover it shows a mirrored screen, during boot it goes to sleep.
The Motherboard is somewhat special of the Z240 SFF, it only has 3 Displayports as video out. Im not using a gfx card, just the intel graphics of the i7 6700, thus a 530.
I found this post describing some information regarding the video out ports, but so far I haven't figured out how to change this. Right now im using a clover folder from Maldon, he could not help me with the 2nd DP.
I figured I have to change the ports using KextsToPatch in clover but im not sure exactly how. if someone can help me or give me pointer it will be much appreciated.