HT201236: Mac keyboard shortcuts
Learn about Mac keyboard shortcuts
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Helpful answers
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Oct 30, 2015 10:32 PM in response to AbhinavSharmaby kaz-k,It means Mac cannot find system to boot. Try resetting NVRAM as well as SMC which could solve the problem.
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Oct 31, 2015 3:08 AM in response to kaz-kby lllaass,If those reset do not work:
- 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
- If you do not have a backup use disk utility to restore the internal disk to an external disk so you can try to recover data.
Then format the startup disk and do a fresh install of OSX