Boot chord OFF

If you mute your volume, the boot chime will also be muted.

Psst! will do that easily, and it's free. It can change just the boot chime volume, or completely mute it.
http://www.macupdate.com/info.php/id/16780/psst

BTW, the boot chime is part of the POST, which tells you something about the health of your Mac hardware. My suggestion is to keep it as is...
 
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