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
Question marked as
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