Noise through speakers when Airport active

Hi,
I have a strange problem with my new MBP: When I set the Airport netwoork as active, I hear LOUD noises (sort of like a modem sound" through the speakers, this is not affected by the volume control (seeme to be at maximum all the time, very annoying)
All I can do to stop the sound is either turn Airport off or insert a dummy plug in the headphone plug...
Anyone with the same problem or any idea for a solution?
Thanks
Allan

I'm afraid I can't help, except to say I have the same problem with my FW 400 and 800 ports when I connect a Firewire hard drive. The noise sounds like it's coming from inside the computer itself and it happens even with the audio muted. I wonder if this problem might be related to the Firewire "noise" / "chirp" issue I've seen discussed?
15" PowerBook G4 (1.67GHz)   Mac OS X (10.4.7)  

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