My MacBook Pro air
My MacBook Pro air Won’t go past start up
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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."