I bought the Asus ROG PG279Q and when I first connected it to my old desktop, the monitor would randomly display nothing after a few minutes of usage. I tried it with both the Display port and HDMI cable provided with the monitor. I thought it was because my GPU couldn't handle the monitor, so since I was in need of a desktop upgrade, I decided to upgrade my desktop completely with all new parts. Even after building my new desktop, the monitor would display nothing after a few minutes of usage. I could be playing a game or just browsing the web and it would completely turn blank and become unresponsive to anything, OSD, power butt, mouse clicks or keyboard strokes. The LED on the stand would remain lit and the power button would still light red. This happens with both the HDMI and Display port. I have updated all my drivers for Nvidia, all the driver and tools from the Asus ROG PG279Q support page. The only way for me to get a display again after it blacks out is to disconnect the power cable, wait a few seconds and reinsert the power cable. Even though it would show the display, after about 30-40 minutes of usage, it would repeat itself again.
Specs:
Ryzen 7: 1700x
Asus Crosshair VI Hero
EVGA Supernova 850 P2
EVGA 180ti FTW3