Whale sounds emanating from G4 MDD

Last night I began to hear this faraway sound, something like a singing whale in the room. Although this sound seems to be very non-directional, I have now determined it is coming from my computer tower. Sometimes the whale song is louder and sometimes softer. It is never very loud but sometimes it is loud enough to be distracting. It comes and goes. Sometimes I might go 10 minutes or so without hearing it, then it starts up and comes and goes for a minute or a couple of minutes.
Can anyone speculate on what it might be coming from and give me a heads up on worse problems that might eventually come about from it? My initial thought was that it might be a fan or a hard drive getting ready to crash.
Thoughts?
Richard
I have a mirrored Drive Door dual 1 gig processor Mac.

Hi, Richard!
It might help if any of the members ever heard the sounds of a whale singing in a room, because I can't imagine what they sound like when they do this. It sure does evoke a pretty strange vision in my mind though!
Seriously, if it's a high pitched noise, it's likely to be a drive motor bearing or fan bearing. If it's a drive bearing, you would be prudent to replace the drive. If it's a fan, you may be able to coax it back to normalcy with a tiny bit of light lubricant applied to the fan shaft with a pin oiler. However, you really need to first pinpoint he component...
Unless you have iTunes playing whale songs in the background, the sounds are likely emanating from one of three fans, the optical drive motor (if a disc is inserted), or one of your hard drives. You might attempt to pinpoint the source by fashioning a cone from a file folder to use as a listening device, opening the Mac's side door, and placing the small end of the cone against each of these mechanisms while listening with your ear at the other end. (Most folks don't have a stethoscope handy, but this works pretty well.)
While you've got things opened up, with the computer shut down, use a can of compressed "air" to blow out the dust bunnies from your fan assemblies.
Gary

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