Since I received my G5, I've noticed a noise coming out of it relating to the intensity of the task at hand or movement of quartz effects on screen. Its hard to explain, but i'll do my best. The noise as a VERY high pitched ring. Like a ringing in your ears almost. Its not my cinema display or speakers. I've narrowed it down to the computer its self. Its also not fan related as it occurs both while the fans are at full blast and idling. Here are some examples of when I might hear this noise: Icons bouncing in the doc. I thought initially that the noise was screen related as it was exactly in sync when an icon would bounce in the dock. (ring ring rgin...ring ring ring) Minimizing windows will do it. Quitting apps will do it even if there is no closing of windows involved with quitting the app. Launching iTunes does it too. Just tonight I was playing around with the energy saver preferences for processor performance. There is a HUGE reduction in the noise if I use automatic or reduced settings. I'm normally on high. Any one else have this problem? I originally thought I would get used to it, but it's just getting more annoying. P.S. this is not the cricket sound that comes out of the computer that many have noticed.