I have a 15" Powerbook G4 and recently my internal speakers have been acting weird. Randomly my speakers will stop working and constantly put out a fuzzing noise that sounds like a t.v. that is on a blank channel. This happens either right when I turn on my Powerbook or later while I am using it. i don't even have to be using an application that invovles sound for it to happen. Also, if I mute the sound on the Powerbook it does not go away. The only thing that works is to plug headphones into it and then mute the sound. However, when this is not happening, the speakers work perfectly. I have tried messing with the sound controls and even re-installing mac osx tiger on the powerbook but it still has the same problem. Does anyone have any ideas on what I could do to fix this? Also, is it a problem with the speakers or something else?