How can I turn off Start up Sound?

How can I turn off the start up sound, on both my 10.7.5 iMac 24" Late 2006 and my 10.8.3 iMac 27" Late 2009 Mountain Lion.
Plus my Superdrive has stopped working on both Computers. Please help asap.
With kind regards, and many thanks.

The best way to turn off the startup sound is to mute speakers before turning off your computer.
Also, apps that help you turn off the startup sound don't work with iMacs. There's a command that will allow you to turn it off without muting your speakers. See > http://osxdaily.com/2012/11/04/disable-mac-boot-chime/

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