MacFormat

More serious problems

What does a flashing question mark on startup mean?

Your Mac can’t find a drive to boot macOS from. The first thing to do is wait, because occasionally a minor problem causes this to happen as a one-off. If the Mac eventually starts up, go to System Preferences > Startup Disk and select your startup drive. If not, try Recovery (see ‘How do I use Recovery to get my Mac working again’, below right).

Could resetting the NVRAM or SMC help to solve my problem?

Inside every Mac

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