IBook making grinding/whirring noise

Recently, when moving my iBook around while it's on, it's making a grinding/whirring noise that it hasn't since I bought it last April. Sometimes the noise stops when I stop moving it, and sometimes it doesn't; right now for instance. Does that sound familiar to anyone, and if so, was it something to worry about? Thanks.
iBook G4   Mac OS X (10.4.5)  

The term "moving" a laptop computer is rather vague. A very vigorous move is entirely different than walking calmly accross a room carrying it much as you might carry a cup of coffee. In the case of the latter, moving it will not harm it. I am speaking from extensive experience of taveling in a moving car with the laptop ON and running and also with carrying it about the house while it is running. Swinging it wildly while you are running is quite different. Apple is just trying to cover there own bases when they tell you to not move it. That keeps them from being liable if you toss your ibook accross the room onto a couch or bed or if you drop it onto a table much like you might drop a regular book.
You may note that many of Apple's adds show people sitting and working on their laptops "on their laps" and other adds show them working on their laptops in moving airplanes. Many people routinely work with their laptops on their laps in bed and have no hard drive problems. Consider the ipod, the Palm Life Drive etc., all have hard drives and they get moved quite vigorously.

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    http://discussions.apple.com/thread.jspa?threadID=336342&start=0&tstart=0
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    Sad faced iPod, but my computer won’t recognize it
    http://discussions.apple.com/thread.jspa?messageID=2242018#2242018
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    http://discussions.apple.com/thread.jspa?messageID=2420150#2420150
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