Computer nosiy when second display dimmed

OK, I know this sounds really odd but I'm glad I resolved it.
I have the 20" imac and an old 17" Apple Studio Display as an extended desktop just to the left of the imac. Well when I got it the comptuer was very quiet, and over the last day or two it was very noise and I could not figure out why. Sounded very much like fan noise or vibrating plastic. So I was kind of disapointed thinking once the computer got settled in and used for a week or so that it would no longer be quiet.
So it happens to be bright in my office today and I open the display preference to turn up the brightness on my second monitor. To my surprise as soon as I do this the noise is gone. I can sit there and play with the brightness slider and make the noise come and go at will.
My old screen is not that bright anyway so I'll just leave it at full brigtness. I expect if I add some space between the displays this could solve it as well, but I like them side by side.
Not a probelm for me now, but just out of curiosity does anyone have ideas what is behind the noise. The noise volume increases as the screen goes from full brightness to about 2/3 brightness. From that point down the volume of the noise is pretty steady.

this sounds very odd, and I have no answer. I have an older 20" dell hooked up via DVI to MINI DVI, no issues with fan getting louder or not.

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It seems strange that the Power Manager would be behaving this way, although speaking with some colleagues they also have encountered similar occurences- but instead describing it as if "the engine were warming up with a high idle, and then returning to a standard idle."
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Thank You lnssd9, I look forward to your response.
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Message was edited by: Stephen Ethan
Message was edited by: Stephen Ethan

Long story short I solved the problem, and it was totally a model issue. It is the HP w2207, which apparently has a problem with iMac 24 inch, the nvidia graphics card, mini DVi to DVI and 10.4 in particular. You see these two devices, just don't get along very well. The imac tries to auto set the monitor at one resolutions and the monitor tries to auto set itself at another, and they will continue to do this indefinitely. However both when I switched to a VGA cable, which I believe prevents the monitor from auto setting itself, and when I upgraded to 10.5 solved the problem.
Personally I didn't mind the upgrade, as I was planning to do it anyway, and is definitely the better solution as there is noticeable difference in the color between the two cables.
Anyway thanks for the help everyone.
Message was edited by: Stephen Ethan

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