How to I reset start up chime

Hello I am using my macbook in clamshell mode and my start up chime is not working. Is there anyway I can reset it?

Pram reset is usually how i do it. P+R+Option+Command

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I used to have it disabled on previous mac systems fine.
I want system sounds to still hear email alerts and facetime calls, but stop the annoying loud startup chime.
Any suggestions please. (startninka app didnt work!!)
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CHIME CRIME update
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I tired the adding programme to Terminal...did not work.
Also 'Chime Stopper'- (yet to test) https://www.macupdate.com/app/mac/13170/startup-chime-stopper
But...
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How do I turn off the chime sound that goes off during start up?

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How do I change volume on start up chime

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I'm rather perplexed as to what's happened to my PowerBook. I'll run throught it
PowerBook 12" 1.33 768
Background:
I've just updated it to 10.4.4, which caused it to get stuck at the Apple symbol and spinning wheel. I had to restart in single user mode and run applejack, restart again and it was fine.
Recently the PowerBook started to not wake from sleep, I'd have hold down the power button then restart it. I thought it had done teh same thing today, but this time it makes the start-up chime but gets no further than a blank (dark, black) screen.
I tried inserting the Mac OS X CD and start up holding down the C key, but still same blank screen (with the added benefit that I'm now unable to remove the CD)
I tried plugging it into an external monitor, but nothing.
I've tried resetting the Preference RAM and the PMU. With some limited success. On occasion after resetting the PRAM, turning it off then back on, it starts with something like a extra blow of air from the fan and white blank screen instead of a black one. It then won't turn off at all, the only way is to pull the power and the battery.
I've noticed that when the ac adapter is plugged in and i've the white screen it flashes very quickly, orange.
I tried starting in Tartget disc mode connected to an iMac, the disc doesn't appear.
I tried starting up with an external firewire drive attached, nothing.
I've tried starting holding the keys for open firmware mode, nothing.
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I did something I'd never done before. I put my HD to sleep to optimize battery performance. I work with podcasts and downloaded a large file. Unfortunately I forgot my battery setting. I chalk it up as a lesson learned, and just bit the bullet and ordered a MacBook Pro.
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How to I reset start up chime

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