Start up alert sound

Hi,
I have a PB 12". The machine makes a alert sound when I start my machine. I would like to disable this sound since its a littel annoying when you open it in a quite office. Now I put the speaker to Mute before shutting down so that next time i dont hear that sound.
Could some body tell me how to disable the sound?
Thanks
PC

Amit, Apple can do a lot of things. OTOH, a lot of clever people can do things that Apple doesn't do even though they can. I haven't tried the PrefPane Matt mentioned, but it could work by using an undocumented part of OS X, which means Apple might not want to commit itself to supporting it publicly. Or, since startup volume is a function of a user's volume setting, could just be a script that changes the user's setting (storing the old one) before startup chimes, then changes it back to the stored volume afterwards--that's functional but a pretty hackish solution to consider "Apple official".

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