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A prohibitory symbol, which looks like 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 version or build of macOS that your Mac can use. But now the Mac doesn’t want to work
Boot to the Recovery Partition by holding Command R when starting your Mac
Select install macOS
Boot to the Recovery Partition by holding Command R when starting your Mac
Select install macOS
Anyone can help?
