Damien, ok this time I calibrated with both screens on. Is there something specific I should do when trying to match 2 screens? My main Screen #1 calibrates easily. What I've noticed - on my "bad screen" - screen 2 - is that when I adjust the RGB controls, it has absolutely no effect on the Current value 5800, it stays at 5800 and I can't get it near my RBG preset target 6500. I can adjust for contrast and luminance though.