8481murphy Said:
"Reset MacBook Air but then nothing happened. Now it is dark and says to go to support.apple.com. Just a dark screen and a big question mark directing me here."
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Troubleshooting a Mac with a Question Mark:
Three Things...
I. Go here: If your Mac Starts Up to a Question Mark - Apple Support
II. Mount the Drive:
Boot into Recovery Mode (Hold Down: [Command + R] upon boot). Then, using Disk Utility, see if the Hard Drive is seem. 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.
III. If Neither of the Above Works...
Reinstall the macOS:
Go Here: How to reinstall macOS from macOS Recovery - Apple Support. Important: Be certain to create a backup of your Mac prior to all of this. That way, you can have something to restore from the Mac from, should anything go wrong with the reinstall. Once reinstalled, try this once more.