Intermittent clunk noise

on my G4 PowerBook laptop, I am now getting an intermittent clunk noise similar to when one makes a mistake in typing. The noise is getting more frequent, perhaps every 5 minutes. The CPU readout does not alter and I have gone through the Disk Utility which came up with no errors. I am concerned that the disk is starting to come up with errors. Is there a way to check and verify this, plus correct....or indeed to confirm where the problem is? I have backed up all valuable files.

thanks for the comments. I went through all of the suggestions. I am not certain it is a drive issue. If I turn the sound off, the noise does not occur, so it is coming through the speakers. If it were a drive issue would it not be more of a mechanical noise?
The sound is more like when you mis-type and you get a 'bong' noise. Could it possibly be that some application is getting errors and every now and then sends out the noise? I had a look through 'activity monitor' and could not see anything running that obviously was in error.
Any suggestions on other things to look at?
Thanks

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Thanks for the links. Yes, I've tried everything, and so did a Genius at the  Store today. He took it in the back, then came out, saying that he thinks it's a logic board problem. He told me that he had hit the button to turn it on, and that it had not responded immediately, but came on a few moments later. Despite my best efforts, I have not been able to replicate this behavior. He said he really didn't know much more about it, and that he wished he could, but he was "bound by 's rules" on the matter and had to send me along with the out-of-warranty line. So I'm heading to a 3rd-party guy in the next day or to, and I'm gonna let him run some diagnostics on it.
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Hi, I got my Mac Pro a few days ago, and when it started up I was very happy with how little noise it generated, other that the usual HD clicking noise, which is pretty standard.
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Message was edited by: Deborah Terreson

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chuckbolotin,
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Intermittent clunk noise

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