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Vaporub28
2 years ago

If the question mark is permanently displayed and the Mac does not start normally:

  1. Hold the on/off switch on your Mac until your Mac turns off (up to 10 seconds).
  2. Each Mac has an on/off switch. Hold on to notebooks with Touch ID “Touch ID”.
  3. Use hard drive utility to repair your start volume. Follow the steps for a Mac with Intel processor.
  4. If the hard disk service program has not found any errors or troubleshoots,install macOS new.
  5. If you need further support,Contact Apple Support.

Source: When your Mac starts up to a question mark – Apple Support (DE)