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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.