HT206886: How to get macOS Sierra
Learn about How to get macOS Sierra
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Helpful answers
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Oct 6, 2015 1:23 AM in response to Cal1983by lllaass,- Disconnect all unnecessary peripherals .
- 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