HT201573: How to start up your Mac in single-user or verbose mode
Learn about How to start up your Mac in single-user or verbose mode
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Helpful answers
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Sep 17, 2015 10:35 AM in response to mellucciaby dominic23,Reset SMC.
Choose the method for “On Mac notebooks with non-removable battery”.
https://support.apple.com/en-us/HT201295
Reset PRAM. http://support.apple.com/kb/PH18761
If this does not help, contact Apple.
Genius Bar reservation:
http://www.apple.com/retail/geniusbar/
Best.