Same problem here, only I bought a SECOND-HAND (IN CHILE, LATINOAMERICA) 2015 4k 21.5 imac, I saw it and everything during the day, but at night I noticed that it had pink edges and it was already too late ... personally they don't bother me since They are not aggressive (and with wallpapers is good option to better image,
and in any color other than white it is very very UNPERCEPTIBLE).
a little sad but not much sad.. i think im a little angry,
only my ass is praying that the problem does not get worse ): .......
I attach some photos of my IMAC here:
PD:
Apple, I had a lot of respect in your products, now I prefer that they burn those damn things in hell(and apple company too)
PD2:
Dear Steve Jobs, you never got what you wanted ... on the contrary ... your legacy is stealing money from people, you bastard, You were never revolutionary enough contributing to humanity, making products for extreme consumers and not PEOPLE, you didn't even let someone honest in power.
Buying an imac in the third world is an almost impossible feat for us, your heart and blood boil how hard you work to buy something and this **** happens, disappointed.
I really encourage everyone with this problem and without a solution, the best option is to buy a second-hand external monitor and forget about 4k and 5k, because they are only headaches, hugs.
Cristopher//.
IMPORTANT UPDATE: I have recorded the IMAC with flash of my cell phone and I am almost 90% sure that there is a fine red duct tape or something like red glue that causes the reflection of that margenta color, the rest of the screen no trace of this '' red glue '', I'll upload the video in a couple of hours so they can deduce with me.