What it means — Apple
If your screen shows a flashing question mark, circle with a line through it, or anything else, your Mac is turned on but isn't starting up:
Read the full article for pictures and model-specific details: If your Mac doesn't turn on ↗
Related
- Mac says a software update is required to connect to iPhone or iPad
- Circle with a line through it at Mac startup
- Globe with a warning symbol at Mac startup
- Lock icon at Mac startup
- Activation Lock or system lock PIN at Mac startup
- Image of a mouse or keyboard at Mac startup
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