Why is my Mac book air flashing a file with a question mark

If your Mac starts up to a question mark - Apple Support

Kamtyson Said:

"My Mac book air is flashing a file box with a question mark"

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Mount the Drive:

Boot into Recovery Mode (Hold Down: [Command + R] upon boot). Then, using Disk Utility, see if the Hard Drive is seen. If it is, then see if you need to click the “Mount’ button for it. Try rebooting once more. If of no success, then click unmount button, and then the mount button. Try rebooting once more.