The fan on my G5 is so loud I can't hear myself think!  HELP!

every so often the fan (i think it's the fan) on my g5 turns way up and it's so amazingly loud. i don't know why it does this or if there's any fix...what i do know is that in the last week it has happened more frequently than normal and today it has been revving for the last 3+ hrs!
is this a problem a lot of people face and is there something i can do to troubleshoot?
Jeremiah

Which "model" & "generation" G5 iMac do you have?
Need this info so that the knowledgeable users can provide you with the proper troubleshooting solution(s).
http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh355.html Getting information about your computer
You can have this info displayed on the bottom of every post by going to 'My Settings' which is located in the column on the right under your name, and filling in the information asked for.
Thank you
In the meantime, try the following:
http://docs.info.apple.com/article.html?artnum=301733 iMac G5: How to Reset the SMU (iMac G5, the iMac G5 (Ambient Light Sensor), and the iMac G5 (iSight)).

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