No startup sound on Yosemite

After installing Yosemite, and sorting out varios issues, I still don't get a startup sound?

Hey there Rolf,
Resetting your PRAM should return your startup chime on the computer. This article will walk you through doing that on Mac OS X Yosemite:
OS X Yosemite: Reset your computer’s PRAM
Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
Important: To print these instructions, click the Share button in the Help window, then choose Print.
Choose Apple menu > Shut Down.
Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on your Mac.
Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.
Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
Release the keys.
After resetting your computer’s PRAM, you may need to update your speaker volume, display resolution, and startup disk preferences. For more information about PRAM, see the Apple Support article About NVRAM and PRAM.
Thank you for using Apple Support Communities.
Cheers,
Sterling

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http://www.ifixit.com/Guide/50.5.0.html
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I find this great solution...
<This is a Direct Download Link>
MuteCon for Mac OS
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is a japanese site but the app is in english.
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Help to spread the word!!!
<Edited By Host>

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No startup sound on Yosemite

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