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Old 01-30-2017, 01:42 PM   #42
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Join Date: Dec 2014
Location: Ruhr Area, Germany
Posts: 939

Originally Posted by lgetty View Post
My iMac 5k had some odd video behavior until I went ahead and did a fresh/clean install of Sierra.
This is, what Robert should test ... install the latest Sierra on an external USB HDD or SSD and check, if the same behaviour is reproducable or not.

I did such a test before upgrading to El Capitan ... made an USB-stick OSX installer and installed from that to an external SSD and bootet from that to check if everything runs as expected.

If the test is successful a fresh install is the solution. I wouldn't be astonished, if that helps, because I often found issue reports about Yosemite and El Capitan, that mainly occured with upgrade installations, but not with fresh installs.

I also wouldn't be astonished, if Justin's Apple Store test will be issue free, because that iMac will likely run a fresh install of macOS.
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