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Helpful answers
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Oct 1, 2016 3:56 AM in response to JPRB_Mac_Userby plxmas,I have the same problem.
I wait for next update, than downgrade if isn't solved.
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Oct 6, 2016 11:53 PM in response to JPRB_Mac_Userby Retro4K,I have the same iMac and the same problem after upgrading to Sierra. Green lines? (sometimes other colours) Its really quite jarring to see. Its almost as if the graphics card driver quits before the machine is finished shutting down.
Reinstalling from Safeboot and resetting the PRAM etc doesn't resolve the issue and in the end I just gave up and restored using Time Machine back to El Capitan.
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Oct 18, 2016 9:31 AM in response to JPRB_Mac_Userby aklion,I have exactly same problem in similar circumstances. Here is the video I captured during shutdown https://www.youtube.com/watch?v=YioedHXY6ic
I chatted with their support, they recommended SMC & NVRAM test which didn't resolve the issue. Then they asked me to try diagnostic which again didn't help. I'm still chatting with them right now. I hope this is soft issue and not a Graphics card failure.
If we think logically then it's certainly a firmware/OS issue.
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Oct 18, 2016 1:39 PM in response to aklionby Retro4K,Good video. I don't see how this can be anything other than an OS issue. I've never had anything even close to this issue on ElC. Did you also notice that the little spinning wheel (http://fs5.directupload.net/images/161018/z6ykon6w.png) doesn't seem to show up on shutdown like it used to on ElC?