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Nov 4, 2015 6:37 AM in response to lulu0819by Jason L,Hello lulu0819,
Welcome to Apple Support Communities.
It sounds like you're seeing a flashing question mark on your MacBook Air after erasing some data. The article below provides a lot of great information about the alert that you're seeing and it should help you resolve the issue.
If a flashing question mark appears when you start your Mac - Apple Support
So long.
