Why does the fan come on

Can someone please tell me why the fan sometimes comes on (G5 iMac - desktop1.6Ghz ) and is it a bad thing?

The fan comes on when the unit heats up enough to require more cooling. The fan is actually always on–what you hear is the fan running faster, thus noisier, as the unit requires more cooling.
It is not a bad thing. It would be bad if it didn't come on and your computer melted because of the extra heat.

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