Electonic "whine" from macbook pro when at idle

I got my 2.0GHz MBP today and I'm having a problem that is getting more annoying the more I use it:
When the computer is at idle, there is a "whine" that comes from under the keyboard. It sounds almost like there is a bad ground or interference.
As soon as one of the cores is maxed out or close to it, the sound goes away. As far as my tests have concluded, it is not a graphics engine problem, it is with the CPU itself.
Is anyone else having this problem? I am calling apple first thing in the morning, As I won't be able to use the machine for recording or anything similar because of feedback/noise.
(ps: it is not a fan, it is more like alternator noise in a car stereo)
Macbook Pro 2.0GHz Mac OS X (10.4.5)

It's not uncommon for electrical noise to be heard when idle, particularly if everything else is releatively quiet. I wouldn't worry about it, the machine is just doing it's job. I'm expecting mine on Thursday, so I'll see what it does. My G5 would always make noise when idle, but it wasn't ever enough to be picked up during a recording session or anything.
Here is a segment from the user manual:
"As you get to know your new MacBook Pro, you might hearsystem sounds during startup and when using your hard disk and optical drive. After the MacBook Pro runs for some time, small fans might turn on to cool it, producing a faint sound. System sounds such as these are part of the computer’s normal functioning."
Fan speed is controlled via pulse-width modulation. That could be part of it too. If the machine is stable, though, life is good.

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