Heat, fans, and noise.

These are still issues with my iMac G5 I bought a little over a year ago. It is particularly noticeable when playing games, such as WarCraft or Call of Duty online. It is loud enough that it troubles me that it may damage my machine over time. When I quit a game, the fans get much quieter and the heat seems to go down too. The fans are not a problem most of the time, but launch a game and the fans rev up.
Note that I have a rev. 2 iMac G5, not the first revision that is supposed to be the one with the real problem.

"It is loud enough that it troubles me that it may damage my machine over time."
It won't, as it's designed to do just what it's doing. You might want to inspect inside the back and see if you have any dust or pet hair that needs reduction, which might lower the operating temperature and reduce the burden on the cooling system. Some find it building up in their iMacs, but many do not find anything when they look.
Apple article - "Removing Dust Accumulation From Inside the Computer"
also another article here "Information about cleaning computer components"

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