Mac air doesn’t not start
My mac is not starting and when I reinstall OS on recovery mode
it’s shows a troubleshooting
MacBook Air 13″, macOS 10.12
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it’s shows a troubleshooting
I'm not sure what that means, but if your Mac is not starting up all the way begin with If your Mac doesn't turn on.
That gets some preliminary steps out of the way. Follow each of its steps, including all the links within it, all the way through and including Step 4, which directs you to:
If your Mac starts up to a blank screen
Read and follow each of it steps also, all the way through and including the end, which takes you to:
"If you still need help, please contact Apple Support."