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Apple Mac Startup Sound/Chime - YouTube
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About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support
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What to do if your Mac won't boot up: fixing Apple startup issues - Safemode Computer Service
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How to fix support apple.com/mac/startup - YouTube
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Apple Awarded U.S. Trademark for Mac Startup Chime - MacRumors
If your Mac doesn't start up all the way - Apple Support
The Mac's iconic startup chime is back in macOS Big Sur - The Verge
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