HT201475: Upgrade to OS X El Capitan
Learn about Upgrade to OS X El Capitan
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Helpful answers
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Aug 28, 2016 1:28 PM in response to rlesses05by Carolyn Samit,Hi,
The startup disk may need repairing.
Shut down your Mac by holding down the power button until the screen goes black.
Wait at least ten seconds then restart while holding down the Command + R keys.
From there you should have access to the built in utilities to verify and repair the disk then upgrade to El Capitan.
About OS X Recovery.
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