What should I do if the error persists after reinstalling macOS?

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Grade: Education Subject: Support
What should I do if the error persists after reinstalling macOS?
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If you've reinstalled macOS and error code 43 still appears, it strongly suggests a hardware problem with your startup disk or related components. Contact Apple Support or an authorized Apple service provider for diagnostics and repair options. This could involve replacing the hard drive or SSD, or potentially other internal hardware.