05-09-2020 05:09 PM
This means that your startup drive and/or operating system cannot be located—AKA you don't have a working computer.
Apple has a support article on their website here that should help you get started rectifying the issue.
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05-13-2020 10:53 AM
Sam15 already provided an excellent response and we would encourage you to read over that reply! We did want to add that we know troubleshooting an issue such as this isn't always the easiest. Rest assured, if you are in need of assistance, we have expertly trained Agents ready to help via our Remote Support.