Fans always on.... any ideas?

We have a black MacBook and the fans are constantly on - running loud at seemingly full blast. It happens regardless of how many apps are running. I can shut down all apps and it still is doing it.
Any ideas?

Before you do those resets, open the Activity Monitor utility, select "All Processes", and sort the %CPU column to show largest values at the top. See if there is a process using a lot of CPU. Sometimes a process of which you're not aware gets hung.
Resetting PRAM:
http://docs.info.apple.com/article.html?artnum=2238
Resetting the SMC:
http://docs.info.apple.com/article.html?artnum=303319

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