I love my MacBook Pro. I hate its whine. I made a discovery tonight as I dealt with its high-pitched noise... A couple hours ago I took it off AC power and the whine began, running on battery. I used the machine til there was about an hour of power left on it. So I plugged it back in and let it recharge. I've been watching the estimated time left for complete recharge and it was steadily decreasing. Well, eventually I noticed the whine getting lower and lower in intensity. At the same time, the estimated time left for recharge was not decreasing. But, as I observed, the percentage of charge was increasing. So, it is clear that less and less power is dedicated to the recharging of the battery as it gets nearer to 100% charged. (Understand my logic here?) My point here is, it is clear that the problem is related to the computer's power management. But people have been calling this a CPU whine... Is it possible that this is, instead, a whine eminating from the power supply or battery or something inbetween? What are your thoughts???