Q: On boot, iMac Apple logo blinks red after update to Mac OS Sierra
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by Carolyn Samit,Sep 22, 2016 7:52 PM
Carolyn Samit
Sep 22, 2016 7:52 PM
in response to Headhunter06
Level 10
(124,361 points)
Apple MusicA Safe Mode boot deletes system caches that can help after an update or upgrade.
Follow these steps to start up into safe mode.
- Start or restart your Mac.
- Immediately after you hear the startup sound, press and hold the Shift key.
- Release the Shift key when you see the Apple logo appear on the screen.
After the Apple logo appears, it might take longer than usual to reach the login screen or your desktop. This is because your Mac performs a directory check of your startup disk as part of safe mode.
To leave safe mode, restart your computer without pressing any keys during startup.
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Sep 25, 2016 12:53 PMby Mike Rose1,Same problem, after several calls to Apple they were not aware of this. Tried several re-installs etc and tried usual repairs, removed virus checker and pruned Little Snitch. No significant issues as yet but red box still appears. Time Machine slow and slight problem with mail but neither show stoppers.
Apple suggested I take to Repair as issue does not show on Booting from El Cap on attached disk and first level support suspected damaged disk. S.M.A.R.T. checks show disk ok. I suspect some bug that will be fixed on next update.
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Sep 25, 2016 4:21 PMby Headhunter06,Well, my problems went from bad to worse, and now I have a repair appointment scheduled. So, since the red square thingy didn't seem to effect performance, I got all my files reinstalled after clean install and then went to setup Bootcamp for Windows. Unfortunately, Bootcamp hung during the "partitioning" stage. After 2+ hours stuck and making no progress I tried to kill it, but the "stop" button was greyed out. Left it to run for another hour hoping it would clear, but no luck. So then I killed the process manually. But now there is 300gb of space missing from my hard drive -- does not show as Bootcamp and does not show as available (or not) anywhere. Tried Disk Utility First Aid. No luck with that. So.... Now I will head over to my Apple Store tomorrow to see what they can do. I'm wondering if there is a gremlin with the Fusion drive and Sierra causing both the red box and the inability to partition. Sure would hate to have Apple replace the hard drive. But if that's what it takes, so be it. (Its still less than a year old, under warranty, and the red box/Bootcamp issues aren't my fault.)
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Sep 28, 2016 12:15 PMby ELIiiiii,28 Eylül 2016 Çarşamba tarihinde, Apple Support Communities Updates <
discussions-updates@apple.com> yazdı:
Apple Support Communities
*kgkgkhghkj
<https://discussions.apple.com/people/kgkgkhghkj?ac_cid=tw123456>* has
posted in the macOS Sierra community.
On boot, iMac Apple logo blinks red after update to Mac OS Sierra
<>
I have same problem to. Sometimes when i start up the computer some
graphic card glitch problem appear too.
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Oct 11, 2016 6:21 AMby PRaffles,I had/have this problem too with a mid 2015 iMac retina running Sierra. I worked with level 2 to no avail. I sent him a slo-mo video of the flash just to prove that I wasn't hallucinating. Otherwise it's running fine with the exception of some apps aborting when quitting. The Level 2 said he was forwarding my video to Engineering to see what they think is wrong. That was two weeks ago.
Some programmer in Apple dropped into some condition where he/she use the "red flash" to signify that they are in a situation that they should never be in but just in case they get there flash the logo red.
