Increased Fan Activity

I have a Macbook Pro (2.5GHz Intel Core-2 with 2GB memory) running on OS-X 10.6.
I have some excessive fan activity (a steady 5998rpm) despite the temperature steady around the 41 degrees mark and the laptop on a wooden table. The weird thing is that this happens despite using few applications, and thus a very low CPU. 

I have much the same problem with my G5 running 10.4.7, but the fan problem has been around since at least 10.4.3, and back in Panther it showed up in 10.3.8. The quickest fix (although even this will only just keep the fans under control) is to go into System Preferences --> Energy Saver and set Processor Performance to Highest. For whatever reason, this calms the fans down somewhat. But be careful, because they may start to escalate again if you do strenuous work, such as some multimedia operations (I get problems with heavy animations on certain websites), or if the heat in your workroom goes up too high. (The recent, albeit brief, heat wave here in New England and the one in Europe sent fans into overdrive regardless of processor settings.)
Hope this helps. Maybe Apple will fix it by the time they issue Leopard.

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