AOC CQ27G2U/BK
2560 x 1440 pixels, 27"
AOC CQ27G2U/BK
2560 x 1440 pixels, 27"
Is perhaps in Windows 10, the after mode activated? This function filters out the blue and makes the image a little yellow.
The is monitor connected to Windows 10?
It could be that you have set the monitor menu and the settings on the PC differently.
For example, the resolution is changed when my PC crashes.
I can recommend to do a reset in the monitor menu and restart the PC and then adjust the settings as desired, then it should be OK again.