Macbook M1 startup chime
Having unchecked the box in System Preferences - Sounds to switch off the startup chime the box checks itself again on the next startup. Any ideas please?
MacBook Pro 13″, macOS 11.3
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Start up your Mac in safe mode and choose the M1 Method. The Safe Boot will do a Repair Disk, clear cache files and only load Apple Software, extensions and Fonts so it will load slowly - Normal. Does the Chime still sound when booting this way. If not - there might be some Third Party Software interfering with the Normal Operation of the OS.
To exit Safe Mode - just restart in normal way. Also, your user profile is showing Big Sur 11.3 - there is an 11.3.1 available.
