HT204156: About the screens you see when your Mac starts up
Learn about About the screens you see when your Mac starts up
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Helpful answers
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Dec 14, 2015 10:15 AM in response to jeawalby lllaass,- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
- Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
- Boot to Recovery and repair the startup disk
OS X: About OS X Recovery - Apple Support
- If it is repairable reinstall the OSX
How to reinstall OS X on your Mac - Apple Support
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.