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Question: recently updated sierra but cant log in now

I recently downloaded and installed security updates now I can’t log in. I tried to go to safe mode no luck. Does anyone encountered the same issue and is there any easy way to fix without loosing data

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Dec 11, 2017 8:30 AM in response to Tp925 In response to Tp925

Startup - prohibitory sign at OS X bootup


Startup Issues - Resolve


Startup Issues - Resolve (2)


Startup Issues - Resolve (3)

Boot to the Recovery Volume (command - R on a restart) and select Recovery Volume. Run Disk Utility and select First Aid. Then re-install the OS.


OS X Recovery


OS X Recovery (2)


Dec 11, 2017 8:30 AM

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Question: recently updated sierra but cant log in now