If your Mac starts up to an Apple logo or progress bar - Apple Support

Your Mac shows an Apple logo when it finds your built-in or external startup disk. As startup continues, you should see a progress bar, with or without the Apple logo. This screen might alternate with a blank screen several times.

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If your Mac starts up to an Apple logo or progress bar - Apple Support

black screen with only logo apple - Apple Community

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Sandisk 1TB ssd not getting detected. - Apple Community

If your Mac starts up to an Apple logo or progress bar - Apple Support

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MacBook not starting up - Apple Community