This one is driving me nuts. My HW:
Graphics card (bought new): ASUS GeForce GT 1030, low profile silent, GT1030-SL-2G-BRK, 2GB GDDR5, DVI, HDMI.
Monitor (two years old): BenQ EW3280U 3840x2160
Symptom: X starts, but results in a black screen, which puts monitor connected via HDMI in such a...