macOS Sierra upgrade takes hours

Configuration: Macbook Air 13 "(n ° de série C1MQJ13YG944), passage of 10.11.6 to Sierra"

Problem: During the upgrade the system stops all applications and the screen become black with only a spinning wheel visible. 6 hours later, the screen remains black and shows the spinning wheel.

I hit the space bar and the escape key, but nothing has changed.

The system is fully charged, turned on, and I have a full system backup on a disk drive external bootable.

Press and hold the power button until the computer turns off. Wait at least ten seconds. Restart the computer. Installation now look here where he was and begin to move forward? Or it just restarts your old version of Mac OS X?

Tags: Mac OS & System Software

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