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i get a black screen with a circle with a cross in it when i try to open my MacBook air, how can i use the desk utility if i can open the lap top?
[Re-Titled by Moderator]
MacBook Air 13″, macOS 10.14
If your Mac starts up to a circle with a line through it
A circle with a line through it means that your startup disk contains a Mac operating system, but it's not a macOS that your Mac can use.
A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.
If your Mac starts up to a circle with a line through it
A circle with a line through it means that your startup disk contains a Mac operating system, but it's not a macOS that your Mac can use.
A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.
Try starting it into Safemode, then run First Aid from the Disk Utility.
Start up your Mac in safe mode - Apple Support
How do i use the disk utility if my MacBook Air doesn’t work?
