My Macbook (model MacBook2,1) spins the fan all the time, running ~6200 RPM constantly.
The CPU temperature is only 64 to 66 degrees celcius, which should be normal temperature. The fan should be running around 2000 RPM with this CPU temperature (or it common before the problem).
There's no load on the CPU and I have tried to reset SMC (as was recommended in Apple Support website). I tried to air duster to blow and clean the air vents, but no dust came out.
What could be the problem? What could I try to reduce the fan speed and the noise?
I didn't have any fan control software before, but installed smcfancontrol couple of days after the problem appeared. The software didn't make any difference.