Fan Turns on when in sleep mode

Hi - we have a iMac G5 20" that we recently purchased used. Everything seems to be good, except occasionally when it is in sleep mode the fan turns on at high-speed for a few minutes.
Nothing else seems to be wrong, but it is worrying. Is this normal? Thanks in advance!
Finder says Finder v10.4.4 - assume that is OSX 10.4.4?

Those are also good suggestions for keeping things running smoothly.
I did see that OP was running 10.4.4, and updating to 10.4.6 might be a solution. I prefer to use the combo updates also as some users have reported problems that started when they applied the deltas through software update, but were fixed by re-applying the combo update over it. Therefore, since I have broadband I just skip the possibly problematic deltas.
Since we are now on the topic of OS updates, be sure to follow some basic procedures that will reduce the possibility of it causing more problems than it solves.
Make sure that you back up everything first. I clone to my FW drive with SuperDuper so I can boot from it if the update goes bad.
After the cloning process is complete, I unplug all USB and FW devices except the keyboard and mouse.
I download the combo, then run all the scripts available in Cocktail before applying the update. Then, after the restart I run the Cocktail scripts again.
I hve followed this process for all minor and major OS updates and have never had a problem with any of them. It is no guarantee that they will not go south, but I like to attempt to prevent problems rather than troubleshoot them later.
Sorry so long. Just wanted to share.

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    TechNet Community Support

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