I own to Dell 24" monitors. And when I look at them, the colors are vibrant and clear. But only at the area I directly look at at a 90°+- angle. When I look to the lower third of the display, I can see a slight fade into yellow. When I move my head down, the yellow tint disappears (90° viewing angle). So a 27" screen would have these issues even more. Could it be, that this issue is just a viewing angle problem?