5K Retina mac developed this in a few months.

mustu

macrumors 6502
Original poster
Nov 5, 2011
341
22
Hello Okay so my 5K Retina mac developed this, dark mark behind the screen. Would anyone have an Idea as you what it is?
 

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Aspekt

macrumors member
Sep 22, 2014
45
8
Like many have suggested, if you aren't able to clean it, and the fact that it is only few months old, simply make a appointment with the store and take it in for a check.

Since we can't be sure if they will replace the whole computer or just the screen, you should definitely backup everything before you bring it in.
 

redheeler

macrumors 604
Oct 17, 2014
7,411
6,978
It looks like something has found its way into the screen, which can happen. I agree with the other posters, since your iMac is still under warranty take it to the Apple Store. It might help to bring that photo as well.