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How Do I Disable The Startup Sound In OS X?

Question:

Can I turn off the startup sound for my Mac?
- Asked by Tim P. January 22nd, 2014

Answer:

Launch the Terminal app on your Mac (it's inside Applications > Utilities), paste in the following, then press return:

sudo nvram SystemAudioVolume=%80

If you ever change your mind and want to get the startup sound back, you can reenable it by using this command in the Terminal:

sudo nvram -d SystemAudioVolume

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