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Muting the Mac’s startup sound - Macworld
http://news.google.com/news/url?sa=T&ct=us/0-0&fd=R&url=http://www.macworld.com/article/135838/2008/10/mutemacstartup.html&cid=1253087558&ei=WXDkSMGwNqjA-wGHhL3cDw&usg=AFQjCNG4n3h7v62BYR5j1-S_TQsOIY0s1Q