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I guess you could hit the mute button on your keyboard each time you shut down. That would do it....assuming you remember to do it. There is an application called Psst that you can use to do it automatically, which suggest that you are not the only princess with a pea under their mattress, but apparently it doesn’t work for all Macs. You will have to give it a try and see if it is compatible with yours. www.satsumac.com