Mac book pro will not boot up
My MacBook Pro will not boot up. Get gray screen with slashed circle.
MacBook Pro 13", macOS 10.14
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Is this what you see, if so You should reinstall macOS on that disk.
Prohibitory symbol
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.
How to reinstall macOS from macOS Recovery - Apple Support