Mac Mini makes high-pitched sound when light images displayed on monitor

I have a Mac Mini 1.5Ghz G4 with 80GB/combo drive.
Occasionally, it will start to emit a high-pitched whine. The whine doesn't seem to be emitting from the built-in speaker. It comes intermittently. It stops as soon as I start shutting down the Macintosh, although if I wait it has stopped on it's own after a few minutes.
Here's the weird part.
I have some control over the volume of the pitch when it is occurring by changing the amount of "bright" objects on display on the screen. I have a dark desktop image in the background. When the high-pitched whine started, I was using Safari looking at a web page with a white background. When I hid Safari, the volume of the sound dropped to be almost unhearable. I switched to OmniOutliner where I had a single window open that was about half the size of the Safari window I hid. It too had a white background. The high-pitched whine returned at about half the volume it was at when the Safari web page was opened. I hid OmniOutliner, and it dropped down again. Resizing the windows led to a corresponding change in the volume of the whine.
I would take it in to a Mac Genuis, except the high-pitched whine starts when it wants to.
I've already googled the problem and all I can find is an instance of a video card in a PowerMac G5 emitting a high-pitched whine.
If anyone can illuminate some ideas on the fix or at least the cause of this issue, it would be much appreciated.
--Joshua
P.S. The monitor the Mac Mini is connected to is a Dell E772c.
Mac Mini PPC G4 Mac OS X (10.4.5)

If you search around you will find this is a common complaint, not of the mini, but of PowerBooks, iBooks and other PC notebook computers. The reason that people report this issue so frequently with notebook computers is because they are so, otherwise, quiet and that makes it easy to hear such sounds. I guess you can put the mini in the category of quiet computers.
What you hear is likely the result of a phenomenon known as magnetostriction. You are hearing magnetic cores, as found in chokes and transformers inside the mini, vibrate at their operating frequency, which can vary according to changing circuit loads, which is why it can be come-and-go and also change in pitch.
Below is a wikipedia link on magnetostriction if you care to learn more. It's nothing to worry about but it can be annoying. Makes you feel like you are sharing your room with a mosquito.
http://en.wikipedia.org/wiki/Magnetostriction

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Mac Mini makes high-pitched sound when light images displayed on monitor

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