My 5K iMac just arrived and I noticed when watching dark things, there are yellow patches on the screen. I heard it's called yellowing? Questions: Is this normal? Is there any way to manually get rid of it? I purchased a maxed out iMac, if I were to take it instore and they agreed to replace, would they give me another maxed out one? Would it be a refurbished one? If you have a retina iMac: Have you experienced this too? Any recommendations on what I should do? It's not noticeable AT ALL apart from when the screen is dark or I'm watching dark scenes of TV shows and etc. It kind of bugs me when I am doing so.