I've updated the monitor firmware and installed the latest driver for it. I also have an Asus VS247H-P monitor that I would like to use as a secondary display. : sometimes normal, sometimes reddish) Please follow the step 1, 4~6 as above to do troubleshooting as well. As long as within this voltage range, the display can work properly. What's worse, every time the monitor is turn on and off the same problem. You aren’t seeing things – a yellow tint is a common issue related to the computer display. SOLVED: I was encountering the same issues that you described with my ASUS VG27AQ (oversaturated colors and greyish colors when HDR was turned on in windows). My problem is that every time I do a calibration, and let the computer either go to sleep, lock, turn off, the calibration resets to this ugly looking thing.