Get a LOUD repeating sound after upgrading to Leopard

I just installed Leopard on two mac minis and a macbook and all three will, quite suddenly give a loud ear-piercing repeating BRRRRRRR sound (kinda like a very high-pitched sports car that never shifts) that will only stop when the computer is placed on mute (when I lower the sound volume the sound does not dissipate -- it's either on or off).
I talked to Applecare and was told that no one else seems to have this problem (nice to be unique), and thought it was because of a faulty install disk. I did a Time Machine backup, traded the disk in at the Apple Store, and then did an erase and install (clean install) and then put my programs back on via firewire from an external hard drive - and the problem persists. It sometimes happens when I have external speakers on (which is a very nice affect!) and sometimes without external speakers.
Any ideas or suggestions? Thanks!

I just try to find out the reason. Did someone of you ever install "TheftSensor" from Orbicule (This used to be an alarm system for the MacBook to be switched on and off by the Apple Remote)?
I just ask, because TheftSensor made an alarm sound which could not be stopped in any way, except switching off the Mac or removing the battery.
Thanks!

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Message was edited by: a j

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Online: Yes
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Get a LOUD repeating sound after upgrading to Leopard

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