Turning on your Mac only to be greeted by a blinking folder with a question mark is a terrifying experience. This symbol means your Mac's firmware cannot find a bootable operating system (macOS) on its internal drive.
Why does this happen?
This usually occurs for one of three reasons:
- Corrupted OS: A macOS firmware update failed halfway through.
- Selected Startup Disk: The Mac is trying to boot from an external drive that is no longer plugged in.
- Hardware Failure: The internal SSD has physically failed.
Fix 1: Re-select the Startup Disk (Intel & Apple Silicon)
Sometimes the OS is completely fine, but the NVRAM is confused. On an Intel Mac, hold the Option (Alt) key while powering on. On an Apple Silicon Mac, press and hold the Power button until you see "Loading startup options." If you see your internal "Macintosh HD", select it. If it boots successfully, go to System Settings > Startup Disk and re-select it permanently.
Fix 2: macOS Recovery (Intel & Apple Silicon)
If the drive doesn't appear, you need to enter macOS Recovery. On Intel, hold Command + R while booting. On Apple Silicon, hold the Power button and select Options. Open Disk Utility and run First Aid on your drive. If First Aid fails, you will need to erase the drive and click "Reinstall macOS".
Fix 3: The Nuclear Option (Apple Silicon Only)
If Recovery Mode refuses to load, or if the SSD doesn't even appear in Disk Utility, your Mac's firmware might be deeply corrupted. You will need a second Mac to put the broken Mac into DFU mode and flash a fresh Universal IPSW file.
Related Guides
If you are troubleshooting Apple firmware issues or managing device updates, explore our other step-by-step guides: