Noise through Speakers when using Firewire 400 port.

Can anyone explain to me why my G4 Powerbook would make squealing noises when I have anything plugged into the Firewire 400 port? It is driving my crazy!!

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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