Mac World Icon, How to fix?

If your Mac can't start up from its built-in macOS Recovery system, it may try to start up from macOS Recovery over the Internet. When that happens, you will see a spinning globe instead of an Apple logo during startup: 

To start up from Internet Recovery manually, press and hold either of these key combinations at startup:

• Option-Command-R
• Shift-Option-Command-R
• Learn more

If startup from Internet Recovery has been unsuccessful, you will see a globe with an alert symbol (exclamation mark):

If you see the globe and alert symbol, try these solutions:

• Make sure your Mac can connect to the Internet. If you aren’t prompted 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 may not allow the Internet access that macOS Recovery needs.
• Try again later, because it may be a temporary issue.
• Start up from another disk or volume, if available, or use a bootable installer to reinstall macOS.

If you still need help, please contact Apple Support.

Please refer to About macOS Recovery on Intel-based Mac computers.

The screen with the Globe is telling you it has begin using Internet Recovery. The download must complete for Internet Recovery to present a menu of Utilities it can run for you. Internet Recovery typically takes about ten minutes at broadband internet speeds to download the additional code to be fully functional.

Your screen appears to also be offering you a choice of Wi-Fi networks. Be sure a Wi-Fi network has actually been selected, and that it is not sitting there waiting for you to choose. (Actual downloading may show a progress bar.) After completely erasing the disk, Internet Recovery may or may not remember your Wi-Fi password, so you may need to provide it yourself to make the connection.