iMac 27" 5K Late 2015 screen artefacts on shutdown

Update: All sorts of weird little problems since, but nothing graphics-related. I did another completely clean install on both my Macs (plus my family's), and everything now seems resolved.

It seems doing a completely clean install from USB, and NOT migrating anything over (manually copying my files and reinstalling programs instead of using Migration Assistant) has made everything run way smoother. It's a pain, but has been worth it.

I was able to obtain a full refund on the cost of my 2015 27 inch retina machine from the retailer after issuing a 'not happy' letter to Apple. I now have a 2017 27 inch machine and High Sierra runs fine. Also the beach balling has ceased and the Apps icons load instantly.

I am convinced certain 2015 machines are faulty.

I fear upgrading to High Sierra since I had the same artefact issue with my 5k iMac late 2015. I am now running El Capitan and hoping High Sierra has resolved this. I miss upgrading without a care in the world Apple. Is getting bigger getting sloppier?

I was hoping for Apple to be an exception to the rule.

Hi, All,

I was one of the early ones with the multiple problems including shutdown and startup screen issues, having changed the ram and apple changing the motherboard and HD on my late 2015 i5, I finally got feuds with Apple as they swerved changing the machine (in AppleCare warranty!).

I bought an ex-demo i7 4ghz, 32gb ram, flash drive and still had the same sort (slightly less) issues, which included the odd shut-down graphics issues, normally after a busy day.

To be honest, like most I decided to live with the problems, I'm talking about multiple little problems as well, and I don't have lots of nonsense downloads or dodgy apps either, this is a work machine that's looked after.

The annoying thing is for 25 years and maybe 20 Macs, I couldn't name you any problems at all, ever... and since December 2015 the two late 2015's have been a constant nightmare, the problems rotate, I may have them for a month or two, and then they come around again.

I am now having a problem with icons doubling up in finder and also finder restarting when I select the applications folder; I haven't had this for maybe three months.

I also have a weird issue that's new, the top right hand of my screen, the grey bar which has the date is pink, it fades back to grey after maybe 5 inches if I screen grab it the picture is grey, but I have taken a picture with my phone - included.

Also have a problem with the fan; sometimes it works, sometimes it doesn't.

I have upgraded to High Sierra in the hope it would cure the fan, so far it has, BUT

Huge screen artefact just a minute ago, a big multicoloured flash and what sounded like an electric spike or short.

The fun never stops, do I want to start now leaving this one with AppleCare for two weeks to be advised everything is fine...

Not really...

It is what helped elevate Apple that will bring it down, or at least it’s reputation in the short term. The closed ecosystem is what made this possible and it is it’s

instability now after all the tweaks that would allow it to be better for gaming, variety in hardware etc. Rushing not working perfectly, products in the market and then not fixing issues in the lifecycle of a OS is purely irresponsible. It was something Microsoft has done many times over the years. Just the other day IOS 11 removed the app switching functionality on all 3D touch iPhones, in an attempt to sell more iPhones 8 and X I assume. I did not miss not using the home button. In a graph with an upward tendency there is corrections downwards, and this applies to everything in life.

Let’s hope this is the case. Otherwise this is another example of a company growing big enough to afford deflecting from excellent customer experience to money making arrogance.

In the meantime I am sticking to El Capitan.

I agree.

How long ago was it when the only publishing software used was Quark, hugely expensive but a requirement, I can't remember the last time I had a quark file supplied or even heard the software mentioned.

I also recall reading the following:

"Among his last advice he had for me, and for all of you, was to never ask what he would do. 'Just do what’s right,' " Cook said.

The crazy thing is I adore these products; my iMac was built at the cost of over £3,000, and I must spend over 25% of my working time trying to work out what's wrong with it.

It's in warranty with Apple care + but the manufacturer won't replace it, they will have me take it to a repair centre for to weeks and then confirm its fine.

Just do what’s right.

As we speak I'm trying to decide if I go back to Sierra or El-Captain, I know many say if you do it right and you know what you're doing it's fine.

I have had Macs for over 20 years and never had problems until my late 2015 iMac, for the last two years and months in AppleCare I still had issues, I upgraded to an i7 4Ghz fully loaded and had problems, although they had got better.

My hope was High Sierra which sounded like it was optimised for high-end machines with flash drives, would finally fix the niggles.

NO, a lot of the original Sierra things are back, including closing screen artefacts; my iMac is also generally much slower maybe 10-20%, my Etrecheck report used to be 1.28 to 1.32 now it's 1.50.

As I mentioned, I'm running a late 2015 i7 4Ghz, 32GB ram, flash drive etc. and I get spinning balls and screen freeze/lag with just email open, safari can freeze the screen for 10-20 seconds.

The latest version of InDesign is not listed as compatible yet ( I think) either way the screen can freeze, basically loads of problems and some of the old ones back.

I have seen others say it's your thought for upgrading and that it's fine elsewhere, I keep a clean, updated Mac, I didn't install a beta version, I got a notification for the App Store for an upgrade.

I have a fairly current high-end iMac that's brought to its knees over basic software and find I'm spent 25% of my working day working with problems, admittedly I can restart and clear the cache, but don't want to.

SORRY, I went completely off topic there.

To answer your question, I would say no 🙂

Agreed, on the late 2015 iMacs, I still think its graphics related, although, I had everything replaced on my other late 2015 i5.

I have just looked up the cost for a new iMac with the same spec as my i7 - £3,638.

Although they are offering £495 for my Late 2015 27" i7 4Ghz, 32GB ram, 512ssd - I'm was tempted and then saw they have a refurb i7 - same date and spec but with 16GB on sale for £2,700!

I would probably get around £1700 for mine on the market, but wouldn't feel right passing it on as it is, I'm now living with the problems, as I have since late 2015.

I have ongoing glitches (most days), a restart normally sorts it out.

What's puzzling to me is the list of problems I'm having, it's always changing, I find as one glitch fixes itself, something new will happen.

The startup and shutdown artefact glitch fixed itself for a few months, then appeared back with HS.

It hasn't happened for quite a few days now.

But, I am having this today, and it's a brand new glitch, for me anyway.

Glad to hear you got everything sorted and your 2017 iMac is good, you never know, I might get tempted, but can't see it yet.

Obviously it should be red (as bottom) but after a short sleep the colours shifted, only a file save and PS restart would fix it.

Just as a final note, I have noticed the screen colours a lot darker, just thought I would mention.

The thread has been quiet so hopefully its just me!

Hi,

I have problems similar to the iMac 27 "Retina 5K late 2014 model. After quenching becomes transverse color lines as many users here. Is MacOS Sierra problem or a hardware problem. Will El Capitan same problems?

I also installed a new developer version of MacOS Sierrasta, but two days have been used. Yet I can not say whether the problem.

These photos were taken before the beta version. This is a public version of MacOS Sierra

I just bought a new 27" iMac in Dec 2016. Have the same problem.

My iMac isn't even a month old.

Does anyone know if Apple addressing this issue on iMacs they are currently selling?

Anything we can do if trying to make "new" purchase?

Aklion,

I did what you suggested. I reported to the feedback team today, Jan 13, 2017.

I bought a 27" iMac just a few weeks ago, and have seen green, pink, and black horizontal

lines across the entire screen.

What baffles me is why they keep shipping it with a known problem.

Hey, the same problems persist even if the latest MacOS Sierra developer version is installed. My iMac (Retina 5K, 27-inch, Late 2014), which is a customized version. Maybe I should go back to El Capitan and experiment works better?

Here is a picture after shutting down. May work better after the new update, since there is no time to become

I have the same problem bought me iMac 27 "5 k i7 ssd m395 2 Gb.

Several have changed me what times is the third iMac that I sent and the same attached a video.

https://youtu.be/-zZWuYto9gQ

And a screenshot of the video image.

I don't know if return it and wait for the new 2017 or wait for Apple to fix it.

The iMac works correctly.

Thank you.

I have just received a new iMac 27" 5K Retina from Apple in replacement for a so called faulty model which also exhibits the same shutdown artefacts as the previous one did! Apple went to extraordinary lengths to try and fix the previous iMac. They replaced the LED screen twice! The main mother board twice! as well as both RAM chips and to no avail. That's when they decided to changeover the entire computer at no charge to me. The handling of this was impeccable and while I still have a (new) computer with exactly the same problem, I am pleased to know from this forum that apart from this quirky shutdown artefacts syndrome, the computer works beautifully! I sincerely hope that this quirky problem is fixed in the forthcoming Sierra update to 10.12.4 Apple should be aware of the problem by now and I would be going to Apple Support for help in fixing this problem as it seems that it affects all 27" iMacs with 5K Retina under Mac OS 10.12+ Hopeful that a firmware/software fix will happen very soon!

Update: I don't know where I saw this (maybe some pages up on this forum), but this has fixed the problem so far (last 2 shutdowns at least - fingers crossed):

Change the resolution from 'default for display' to one to the right. 2880 x 1620.

Haven't tried any other settings, but problem seems to have gone away on past 2 shutdowns. Will verify. Anyone else want to try this?