Since upgrading my PowerBook (G4/400 Mhz/384 MB RAM/10GB HD/10.3.2) to iTunes 4.2 and QT 6.5, I hear an occasional static noise during swtiches from applications and external FW400 HD activity (which holds my music). I checked the message boards on the iTunes discussion list, and it seems a few people have experienced the same problem. There were no clear solutions. Any suggestions? Thanks in advance. Mike