Computer makes odd noises

Well, I'd like input on two sounds that come from inside the computer and I will try to be as descriptive as possible:
1). A very faint (not continuous) squeaking noise that goes when the fans work up a little, but also remains when they quiet down. This happened once so far.
2). A very unusual tapping/light bonking noise (for a lack of better word) that happens occasionally, but not every time, the computer has just shut down or started up.
I don't think it has to do with the fans, because they sound normal, and I recognize the usual "loading noises". I just don't know how much concern, in general, is to be put on the more rare sounds coming from inside the computer. Everything appears to be working fine but I'd like to make sure it's not something to be too concerned about.

I should probably know this, but what is the proper way to clean the fans?
I'm afraid I have never seen a guide to fan cleaning for iMacs, Behnaz. Its a pity, because I suspect that this is an issue that is implicated in quite a few peoples heating and fan noise issues with the iMac. It would be nice if Apple offered a regular "annual service" for such things!
The most basic step is to carefully vacuum air intake grill on the lower edge of the computer. Some people have reported that this alone makes a big difference.
The next step would involve removing the back and following the processes for fan removal accessible through http://docs.info.apple.com/article.html?artnum=300205 to access the fans, and gently clean the blades with a miniature vacuum cleaner (much better than using compressed air, which may simply blow the stuff into a place where it can do more harm than good) and a cotton bud or similar.
If your computer is still under warranty , though, bear in mind that you will void the warranty if anything goes wrong, and that you should take regular "antistatic" precautions. In such a case I would suggest getting it done profesionally by an Apple dealer. In a bad case it may be better to simply replace the fan.
http://www.usd253.org/techsupp/cleaning.htm has some general iMac cleaning instructions.
Cheers
Rod

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