Cannot get rid of flashing question mark

Hello, Jaydor1524.

The flashing question mark indicates that your Mac cannot find a valid startup disk, one with a properly installed macOS.

Please see this support document.

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

https://support.apple.com/en-us/HT204323

You will need to reinstall your macOS software.

Read what to do "If your Mac starts up to a question mark", click here --> https://support.apple.com/HT204323

- If you still need help, please contact Apple Support ( https://getsupport.apple.com/?caller=kbase&PFC=PFC1003&category_id=SC0054&symptom_id=20225 ).