Weird sound when entering optical-in cable

My new PB 17" hi-res makes a weird sound when I insert the monster optical cable into the optical-in jack. The sound it makes through the speakers is the sound of air getting released under pressure, at a very high sound level.
The optical cable is attached to a Sony DAT recorder. If the recorder is on before inserting the cable, the weird sound comes immediately when inserting, if the DAT is off the weird sound comes when powering on the DAT. The same happens when taking the optical cable out.
Since this happened the first time the system sounds where gone (like when you empty the thrash bin etc.). After a restart I sort of got them back. The only system sound I get is a very tiny, short bleep, verry different from before. Also now sometimes several keys on the keyboard produce a sort of bleep (not mechanical I think) when I use them.
Anybody experience this too? My previous PB 17" (G4 1,67) didn't have this weird sound, whether the DAT was on or off.

Mac_Dutch, I think that as long as you have the Dat recorder on you will get this sound. This is feed back the same as plugging in a Guitar into and Amplifier that is turned on..
On restart you will notice a similar sound momentarly as the computer either comes awake or restart as it boot up and starts all the process...Cheers...Don

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