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Root Disabling the annoying start-up sound

/system/customize/resource then delete htclightningbolts.mp3 or something like that. Can't remember the exact name.

You need root access to do this.

To add to this, as a personal preference, I don't like to delete files like that in case I ever want them back. I just add a .bak file extension to the end of it which makes it unusable. Then you just delete the .bak off the name if you ever want it back again.
 
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