TL;DR: Has anyone had success with getting screen replacements for retention and dust on 5K iMacs? It's the issue that just won't go away... display imperfections. Please don't judge me: I'm not the sort to exchange a product 15 times because of a supposed non-issue! I've had my 2015 5K iMac since they came out and it has always suffered a degree of image retention, ever so slightly worse than my 2014 iMac 5K, but not enough to really kick up a fuss about, especially with Apple considering a degree of retention - or persistence as they prefer to call it - normal. But over the summer months it's been getting worse. A lot worse. It seems to be temperature related somehow. Indeed, the retention is most vivid in the lower centre of the screen, which being where the exhaust fan is on the rear, I suppose could be the hottest point. And as the ambient temperature rises, I frequently wake my Mac to witness an imprint of Finder and other windows on my lock screen. And the screen is set to sleep after 15 minutes of inactivity! On top of that I now have a wonderful spot of dirt in the middle of the screen. Very small - again probably so small that a Genius will fob me off. I've never noticed it before, and it's the sort of thing I would definitely notice. But I cannot fathom how dust has appeared under the glass when the display is fused to the glass. So these two issues, which in isolation I probably would have ignored, are now something that when combined I think I should pursue, especially considering resale value. I dropped well over £2500 on this machine, after all, and for all we know, the 7th will bring new iMacs, and I'll be popping this baby on eBay. I've got an appointment at the Genius Bar on Friday. It's a fair drive and a pain to haul the iMac through the precinct. Am I a fool for pursuing this; does Apple just say this stuff is within tolerance?