Odd Noise on Power On

Whenever I power on my iBook (or wake it from sleep), I hear a loud grinding-like noise for about one second. The noise sounds like a fan, although I've run the Apple Hardware Test and the fan sounds fine while running. Is this just a normal noise it makes when powering on? I've had two other iBooks (dead pixels, exchanged), but I don't remember if they made this noise or not.
iBook G4 Mac OS X (10.4.3)

I believe that it is normal...its the sound of the hard drive, fans, and other components turning on at the same time. If it only makes the noise at start up...don't worry. It you start to hear the LOUD clicks during normal use...you may have an issue. (Some clicking sounds are normal as the hard drive parks and unparks)

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{Personal Information Removed}

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