flashing file with question mark
i was trying to erase everything on a second hand macbook air but then i cancelled it, now it has the flashing file with a question mark on it. What do i do to get it back to normal?
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Erasing everything is a good start, so you probably just need to reinstall macOS.
Read If your Mac starts up to a question mark - Apple Support. Step 3 contains the link to reinstall macOS.