Bit of an odd one - upgraded to Mac OS Sierra, all working fine. When I shut the iMac down, the whole screen displays weird artefacts - (graphics glitch?), then shuts down fine. So not causing a problem, per se, but wondered if anyone else has had this issue?
iMac (Retina 5K, 27-inch, Late 2015), macOS Sierra (10.12)
it's useless to change iMac with new one.
the artefact is ONLY in OSX Sierra.
if you go back to El Capitan artefact doesn't appear.
I hope next Sierra update solves the problem, otherwise I go back to El Capitan
Thanks to everyone who is responding to this thread.
It's so helpful to hear from others who are experiencing the same thing.
I was so worried it was the video card, but all of your posts have indicated it's software, which means
Apple can address the issue at some point.
Not sure how to go back to El Capitan if I don't have that installer.
Can we download it from Apple site? iMac will come with Sierra installed.
I actually filmed the problem and put a couple of videos on Youtube and then also forwarded this to Apple:
1: https://www.youtube.com/watch?v=8BoCfWj2wFQ
Similar problems have also iMac 27 "Retina 5K (Late 2014). The graphics card is AMD Radeon R9 M290X, 2048 MB, 3.5 GHz processor Intel Core i5 and memory 24 GB 1600 MHz DDR3.
These problems do not have OS X El Capitan 10.11.6. I suspect that it is a software bug?
100% certainty can not be, because Apple has not been confirmed. This is my own assessment and experience of El Capitan.
Does anyone have the same iMac as I do?
@grdh20 - For screen shots, I used a different device.
I used my iPad and captured both video as @Neutie did and took photos.
Or, you can use a camera on a laptop, or stand alone camera and upload the image.
I had the iPad turned on and sitting next to my iMac each time I shut it down.
I was able to capture what the screen was doing.
But, I did have to make sure I had the iPad on and ready to go.
Good afternoon everybody:
I've received this from apple.
Apple is aware of reports of this issue and it is under investigation. We advise you to keep you computer up to date, and there is no need for you to take the iMac to the store.
So, we just have to wait.
Problem still exists in the latest update but by the sounds of it, it looks like Apple have been apprised of the situation and will resolve it in due course.
I was concerned when I wasn't aware that it was widespread and that perhaps it may be due to a hardware failure. But now that I know that's not the case I really don't worry about it much anymore. A bit disconcerting but it doesn't impinge on my experience.
Good Evening
i can confirm that the new update (( doenst work at all ))... after speaking to apple today 24th January 2017 after they replaced my other 27* 5k iMac for one which was built in September 2016 apple are looking into this problem. more people who phone up and speak to apple the quicker the problem will be sorted
(( They are changing all 1tb fusion drives for flash drives for free )) (( jokes))
Regards
Good Evening
i can confirm that the new update (( doenst work at all ))... after speaking to apple today 24th January 2017 after they replaced my other 27* 5k iMac for one which was built in September 2016 apple are looking into this problem. more people who phone up and speak to apple the quicker the problem will be sorted
(( They are changing all 1tb fusion drives for flash drives for free )) (( jokes))
Regards
Same problem here with iMac Retina 5k 27" late 2015, Mac OS 10.12.2. Multicolor glitches on shutdown. As long as it's not causing wear and tear on the hardware, and doesn't happen while the computer is up and running, I can live with it. Not a very smooth job of integrating software and hardware on the part of Apple, though.
I've had power-supply problems with iMacs I owned years ago, and it crossed my mind that the display glitches could be a symptom of a power-supply issue, like power to the display spiking or glitching on shutdown. But from previous comments on this thread it sounds like more of a software or firmware problem. I'm not lugging the thing back to the store until it actually stops me from working on it.
I'll be keeping an eye on this thread.
God I hate logging in to these Apple forums on Firefox. It always takes 10 tries before I can post logged in. Anyway, in that the hardware glitches when used with any version of Sierra, if it is hardware related, it is likely a driver issue with these 15 imac cards since it reverses for those that have backed down to el capitan. My money is on a funky Sierra gen kext related to the vid cards. Yes thankfully the problem rears up only during a shutdown or restart situation. Doesn't seem to be any lasting damage. It's just kind of jolting to see.
Etuj,
additional info - Today I had call with Apple support (NL) wrt to two problem. They informed me that both issues (domino effect & coloured screen during shutdown) are acknowledged by Apple. They think its now HW related issue and they expect apple to release new update soon.
i7, M395X, 1TB SSD, 16GB RAM. It has happened a couple of times but never on El Capitan, in fact shutting down has not been smooth since Sierra came out. I'm inclined to think its software tbh as El Cap had none of these issues. Mine was bought January 2015 with Apple care and this only happened after Sierra install.
Hi community,
same problems with my late 2015 imac 27" running sierra.
I've allready got a brand new late 2015 imac 27" last friday and from the very beginning the shutdown generated this irritating 3-4 seconds during artefakts... just the same way as the first one.
I really hope that Apple reacts now as fast as possible.
Apple actually called me today to gather more information about this problem. The woman I spoke to told me they have been getting a lot of these reports (clearly) and they are fixing it. Hope it will be in the next update.
iMac 27" 5K Late 2015 screen artefacts on shutdown
