Every time I boot up my MacBook it makes its trademark startup sound. The problem is that it does this even when the volume is muted and headphones are plugged in! I can't turn on my Mac late at night without waking up my girlfriend. What is the recommended way turn this off or at least lower the volume significantly? I found this link in an older thread: http://www5e.biglobe.ne.jp/~arcana/StartupSound/index.en.html I just wanted to make sure that this is indeed the only way before I go messing with a third-party app that changes my startup settings and may or may not be Leopard-compatible. Thanks.