What can I do when the screen shows a folder with a question mark?

I tried to reset my iMac and followed the instructions on Youtube. At the end, the screen shows a blinking folder with a question mark. Please show how to fix this problem.

Thank you

iMac 27″, macOS 10.15

Posted on Feb 2, 2021 4:54 PM

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Old Toad

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Posted on Feb 2, 2021 4:58 PM

See this Apple document; If your Mac doesn't start up all the way - Apple Support

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Top-ranking reply

Old Toad

Level 10

215,340 points

Feb 2, 2021 4:58 PM in response to Shooterlv

See this Apple document; If your Mac doesn't start up all the way - Apple Support

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What can I do when the screen shows a folder with a question mark?

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