File this under "I have a bad feeling about...". So whenever I am on a landline phone and I have my PowerBook G4 (aluminum) sitting on my lap, I hear this obnoxious buzzing sound coming from the phone. When I take my PowerBook off of my lap the buzzing stops. I suspect this is a grounding issue because I have a 3rd party AC adapter that doesn't have a grounding pin. I used to have an Apple adapter with the pin until I destroyed it (and I think an Apple replacement is ludicrously expensive (and no, the warranty expired 2.5 years ago)). I'm no electrical expert, but I'm not comfortable with what I'm hearing. Am I being paranoid or....?