Voila, DisplayPort magically starts working again! How retarded is that eh? Unplug monitor from power for 1 minute and then plug it in again. Then I figured out yet another dumbest solution to seemingly complex issue… But nothing changed because one variable in the problem wasn’t really getting changed or “reset”… Was testing different DisplayPort ports on graphic card, turning monitor on and off using Power button, changing input on monitor, nothing. Connected through DisplayPort, “No Signal”. When it was connected through HDMI, image was there. When I was experiencing this issue, I’ve disassembled half of my system, tested with backup graphic card (which only happens to have HDMI output, not DisplayPort so I was basically just testing if the rest of the system is working), reinstalled my ASUS Strix GTX 980 and the damn thing wouldn’t output image through DisplayPort to my ASUS VG248QE. It’s a really annoying one because you often don’t think it’s “just this” and you try to exclude countless other things, wasting time when solution for the issue takes just 1 minute of sitting still.

Though I’ve seen reports with other brands as well. I keep on randomly experiencing this, either after changes I do to system or just when restarting the system and it all of a sudden decides to fuck itself up for no real reason and based on Google, it seems to be a very common thing with NVIDIA graphic cards and high end ASUS monitors like my ASUS VG248QE (144Hz gaming monitor).

Asus vg278he drivers for mac