IMac 20'' 2007 all led on but working

Hi guys, my imac work but the fan is really loud, i saw on the smc the fan is on 5500rpm. How do i slow down the fans? thanks (sorry for bad english)

You can also do a pram reset. http://support.apple.com/kb/HT1379 show's you how to do this. if that don't fix it, then do as Carolyn says, and run the Apple Hardware Test, and see if it says anything's wrong. Whether it says anything's wrong or not, take it into your local apple store, with the info from the AHT, and have them run their diagnostics on it, and see if anything can be done.

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