powermac
iMac Dual 2.0 17'
I may be mistaken, I think I read on macosxhints, of a way to eliminate the sound, a person wanted to kill the sound for when they turn on their Mac at meetings, etc. Here is a program that give you some control over the volume of the start-up sound http://www5e.biglobe.ne.jp/~arcana/StartupSound/index.en.html