Apple Event: May 7th at 7 am PT
I installed Sierra (on my iMac (late 2015, 2.8 GHz) on 09/17/16. After installation, midway through the boot screen, a red square flashes very quickly around the apple logo. I started my Mac up in safe mode and the red square does not appear. I ran first aid in disc utility and it reveals no issues. Today I installed Sierra 10.12.1 and the issue is still there. Is this a sierra bug?
iMac (21.5-inch, Late 2015)
hi dolphin lady, i too have had the same "symptoms" showing up since i installed the Sierra update. Has Apple given you any response as to what is going on? should we be concerned? i can find no thread that has Apple addressing this issue. infact, after the 10.12.1 install the red shows up about 3/4 of the way thru, the screen pauses and the progress bar turns green during this pause then it continues on like a normal boot up.
hi dolphin lady, i too have had the same "symptoms" showing up since i installed the Sierra update. Has Apple given you any response as to what is going on? should we be concerned? i can find no thread that has Apple addressing this issue. infact, after the 10.12.1 install the red shows up about 3/4 of the way thru, the screen pauses and the progress bar turns green during this pause then it continues on like a normal boot up.
Hi podakayne. No response yet. I noticed similar issues when I did a google search. I've not noticed any other symptoms other than at startup. Will post again when i do.
hey i noticed at shutdown no spinning wheel either. saw that on another thread that showed up about this same issue. will post more info after giving Apple an inquiring call.
tbc
Hello,
I recently bought the same iMac model as you have, and have the same problem from out of the box. When the progress bar reaches about half way, the whole screen flashes and then the red square flashes up a few seconds after that. The square doesn't appear in safe mode. I tried resetting the PRAM, and also checked the disk via recovery mode (no faults found either) but there was no change. I upgraded to Sierra 10.12.1 and the issue persists. I've had a few Macs and this is the first with this problem.
Update to previous post of 3/11/16
I've spoken to Apple and they said it's a known fault with this model of iMac and they're working on it. Apparently it is cosmetic only, doesn't impact functionality, and occurs when the user accounts are being loaded.
Thank you for the update.
I got the same explanation. though they say a future update will "probably" correct that. it's not suppose to affect the run of the machine, as young_y stated. thank you all.😕
did it look like this???
Hello,
Yes, that's what it looks like on my iMac.
Yes, exactly what it looks like on my iMac.
red square around apple logo at startup
