I have come across this situation, not with BigW but with Harvey Norman. I use two Harvey Normans. One that is a tad closer started getting dark. She swore black and blue I needed to calibrate my monitor. Yes I might and never had it done BUT I go to the store that's in the different direction a tad further away and I walk out a happy chappy. Spot on what I see on my monitor. So what do you do. Calibrate or go to the one further away. I'll take the later.