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I think it's hardware related. Do you mean a sound when you turn it on (like a macintosh computer) or when it's ready to use (like Windows or Ubuntu?)
exactly, i have had other sony ericsson phones before and they all have startup sound along with the animation.
I personally haven't turned my phone off in around 1 month now.
I don't think it is needed.
Maybe this works -
Boot Animation Changer LITE for Android | AppBrain.com
Weird request.
Go into system/sounds/ and create a folder called poweron and in that folder place your sound file that you want for startup and name it PowerOn.mp3