Hi, I have a powerbook G4 (aluminum) and I recently attached a pair of external speakers to it. I have noticed a faint hum, which I find to be annoying. I set the volume on the PB to 5/8's max, but it's still noticable. My speakers are fairly high quality, and I don't have any problems when using it with my PC (attached to a M-Audio Delta 410). On the PB, they are coming out from the headphone output. I wish Apple made a Line out on the PB, but they didn't. Are any of you guys experiencing the same problem? any solutions?