I've been wondering this ever since I got my iBook in August. This happens very very randomly, and I know it's not a super abnormal thing, because it happened to me on the 14" iBook in CompUSA once. Sometimes when I push my volume up key a few times repetitively (say 3 times). Instead of it just going up 3 bars, the speakers start clicking...hard to describe, they just go click click click click and while it clicks the volume thing comes up and the bars start filling in slowly until it gets to however many times I've pressed it. Now I can't really afford to send my computer in, hence the reason I haven't. It doesn't do this if I press the volume up once, wait for it to come up, and then press it the number of times I need. Hopefully not everyone thinks I'm crazy... It's kind of annoying when I'm trying to show someone something, and press the volume up key like 5 times to increase it quick. The it clicks and goes really slow so I have to stand there and wait for it to go up/stop. *Sigh*. Any ideas?