hi, I noticed that my g9 monitor (type is S49CG954SC) has a white square flashing in the upper right corner when the screen goes black after turning off the computer.
This problem will occur when the refresh rate is set to 120hz or 240hz. But when the refresh rate is set to 60hz, this problem will not occur. I am using dp cable.
This seems to be a common issue with these monitors. I'm not sure what you could do to fix it without setting the refresh rate to 60hz. You might need to get it repaired.
