MacBook Pro Sierra OS not starting after update

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hellfaya Author

Level 1

9 points

MacBook Pro Sierra OS not starting after update

Posted on Dec 17, 2017 4:21 AM

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Answer 1

CarlAVII

Community Specialist

Dec 18, 2017 7:35 PM in response to hellfaya

Hello hellfaya,

After reviewing your post, it sounds like you updated macOS and now your MacBook Pro is not starting. If the computer is not turning on the first article may help. If it is not loading fully on the way to the desktop, the second article may help. If there is a prohibitory symbol or another screen during the boot process, the third article may help.

If your Mac won't turn on
Use safe mode to isolate issues with your Mac
About the screens you see when your Mac starts up

Thank you for using Apple Support Communities. Have a nice day.

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Answer 2

hellfaya Author

Level 1

9 points

Dec 19, 2017 1:24 AM in response to CarlAVII

Thank you Allan. We took the MacBook Pro to the iStore who could not solve the problem ( boot up hanging after the loading bar traversed the length of the bar from left to right - the Apple starting screen) and reloaded the OS, but changing it back from Sierra ( which it had just been updated to, immediately before the problem above) to El Kapitan. Is there a known problem with Sierra OS, and what OS do you recommend?

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