HT204267: If your Mac won't turn on
Learn about If your Mac won't turn on
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Helpful answers
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Jun 24, 2015 2:34 AM in response to eileenmandellby lllaass,Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
Next try booting to Recovery and repairing the startup disk
OS X: About OS X Recovery - Apple Support
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.