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If you can't start up from macOS Recovery

When an Intel-based Mac can't start up from its built-in Recovery system, it automatically tries to start up from macOS

Recovery over the internet. If it doesn't, press and hold Option-Command-R or Shift-Option-Command-R during startup. If none of the key combinations work, review the guidelines for startup key combinations.

When your Mac begins to start up from macOS Recovery over the internet, it shows a spinning globe instead of an Apple logo during startup: 

If you see a globe with a warning symbol (exclamation point), the attempt to start up from macOS Recovery over the internet was unsuccessful:

In that case, one of these solutions might help:

• Make sure that your Mac can connect to the internet. If you're not asked to choose a Wi-Fi network during startup, choose a network from the Wi-Fi menu , if available.
• Press Command-R at startup to try using the built-in Recovery system instead of internet Recovery.
• Connect to the internet using Ethernet instead of Wi-Fi, or vice versa.
• Connect to the internet from a different Wi-Fi or Ethernet network. Your network configuration might not allow the internet access that macOS Recovery needs.
• Try again later, because the issue might be temporary.
• Start up from another disk or volume, if available, or use a bootable installer to reinstall macOS.

If you see a black screen or some other screen during startup, learn what to do if your Mac doesn't start up all the way.

If you still need help, contact Apple Support.