There is a major issue with the retina MacBooks that apple has. I had a very long story about my macbook, saying it in few words, I had my screen replaced 3 times, then the whole machine was replaced 2 times and now my screen is being replaced again, and all because of dead/stuck pixels in the centre of the screen. But now I realise how they appear, and that those dots are not stuck or dead pixels, but are holes, a tiny scratches that appear after the glass panel contacts the dust bits that stayed on the keyboard or the metal ages or trackpad. I mast say that last time when I found three dots again, I have tried gently touching the glass away from those dots with a needle, and without putting any pressure at all, i made another hole/scratch. But anyway, the positive note is that apple keeps on replacing the screens, as they think that those are stuck pixels.
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They would if there was something on the keys left, dust, sand of any kind. Read my previous post, where I have explained how I was thinking that I had dead pixels and eventually it appeared that they were holes/scratches on the screen.
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Can you tell what is the real point in using any sort of covers/palm rests/carbon stickers???
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The image retention of the apple logo (LOL) is because the logo at the back is a kind of a see through plastic thing, try turning the screen off and putting a light at the back of the mac, as well as turning the lights of in the room, you will see what I mean.
Also, when you close your mac and put it in a bag, the screen touches the keyboard as it gets pushed to the keyboard. That explains why there are stains left from the keyboard on the glass.