MacBook Pro – Fix Apple Logo and Prohibitory Symbol at Startup

bootmacbook promacosstartup

My MacBook Pro 15" displays the Prohibitory Symbol on start-up. What can I do to fix it?

photo of the screen

Best Answer

The Apple website mentions what a prohibitory symbol means:

Prohibitory symbol

image A circle with a line or slash through it means that the selected startup disk contains a Mac operating system, but it's not a macOS that your Mac can use. You should reinstall macOS on that disk.

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