Hi all, I've got a 1.25 ghz aluminum powerbook that's still covered under applecare. It was recently serviced, and they replaced just about everything except for the casing and the cpu. Now that it's back and working again, I notice that when I scroll down a page either using the trackpad or using a usb mouse and dragging the window scrollbar, I hear sort of a static-y sound coming out of the grills. Not super loud, but it's definitely there. It seems to get louder as I use the computer more. It's not the fan turning on (I know what that sounds like), it really sounds like a rough bit of static that you can control and modulate by scrolling. The strange thing is that this sound only happens when I'm running on AC power. The second that I unplug it and run off the battery it stops and doesn't start again. I've tried cranking up the monitor brightness and putting it on 'better performance' when on the battery to mimic being plugged in, but it definitely seems like an electrical issue from the adapter. Is this normal? Do you all notice this with your powerbooks, or have you ever been in a quiet enough room to be able to tell? It's bizarre. I can live with it, but am wondering if I'm doing some sort of electrical damage to the machine that I'm going to discover after the applecare has run out. On the other hand, it seems like one of those hard problems for them to be able to diagnose and fix if I were to have it sent in. Any ideas or thought you can give would be greatly appreciated. Thanks!