G5 Dual 1.8: sounds like short-wave radio tuning, weird whistling

We've got a dual 1.8GHz, Panther, that suddenly started sounding weird. The best description I can think of is like trying to tune a short-wave radio, kind of outer-spacey squealing. We disconnected the speakers and the sound went away; if we plug in external speakers after that, we get the sound, so it's being produced by the computer. If you try to play music, you can hear it but it's smothered by the space noises.
Does this make sense to anybody? Any suggestions or similar experiences? I'll go back to the site to boot it to an external to see if it still happens, but I'm pretty sure it's hardware. It's not a show-stopper--this is a prepress machine in a newspaper--but it's pretty annoying and it would be nice to have proper sound back, though I would like to reassure the user that it's only the sound and not a sign of imminent demise.
No APP.
Thanks for any ideas.

Try downloading and installing Apple's CHUD tools from http://connect.apple.com You have to register for a free developer account before you can download anything.
The CHUD tools will install a preference pane for the CPU (this may get installed in /Developer/Extras/PreferencePanes). This preference pane has an option to "Allow Nap". Disabling this feature tends to reduce that noise. It must be re-disabled after each restart however.

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Every once in a while it will just "lock-up", mouse doesn't move, no beachball, no nothing. after about 2-3 minutes the fans kick on extra hard and fast and this thing sounds as if it's getting ready to break the earth's atmosphere, lol
I have no idea where to even look for a problem. I have pulled all the drives and checked them in my Voyager "toaster" drive and they all work fine, and the main drive from the G5 is even bootable and works great, so i'm assumming it's something to do with the G5's hardware.
Is this something that Apple would even fix, (and I don't mean for free), but will they still work on non intel G5's? is it worth taking to apple or does it sound like something I could fix or is there a 3rd party repair place anyone would suggest?
added: Sometimes upon staring up I will see the HD symbol with a line through it, I'll do a hard power down and then restart and it sees the drive just fine. I also tested by removing those drives and putting in cloned drives, it at times gave the same thing, yet the removed drives in another machine work fine, so I'm really thinking this is hardware.
Message was edited by: Chris Fritsche

Chris Fritsche wrote:
Every once in a while it will just "lock-up", mouse doesn't move, no beachball, no nothing.
The original Apple Pro mouse cable frays in the chord just as it exits the mouse, over time, and shorts out causing symptoms similar to yours. You can't see the fray by looking at it thru the exterior covering. This can happen to third party mice over time too.
Mine did it. I plugged it into a different port, so the chord exited the mouse in a different direction, and had very few freezes after that. Once I got over my frugality (cheapness!) I bought a new one. Eventually it got to where I couldn't even work for more then a few minutes without a freeze.
So, try a known good mouse to see if that's the problem. Perhaps borrow one from a friend so you don't purchase something you don't need.
Don Archibald, a Level 5 here, said the USB ports on the keyboard (for you desktop users) are underpowered and can cause this problem also if the mouse is plugged in there. This can even fry the keyboard sometimes (happened to him). Try plugging your mouse into a port on your monitor or tower.
More in this Apple doc.
after about 2-3 minutes the fans kick on extra hard and fast and this thing sounds as if it's getting ready to break the earth's atmosphere, lol
That's quite normal. It's a fail safe, when your OS isn't working, to keep your Mac cool as it has no idea if you Mac is overheating or not.
and the main drive from the G5 is even bootable and works great
In another Mac?
, so i'm assumming it's something to do with the G5's hardware.
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I would try running the extended version of your Apple Hardware Test.
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Is this something that Apple would even fix, (and I don't mean for free), but will they still work on non intel G5's? is it worth taking to apple or does it sound like something I could fix or is there a 3rd party repair place anyone would suggest?
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I also tested by removing those drives and putting in cloned drives, it at times gave the same thing,
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 DALE

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G5 Dual 1.8: sounds like short-wave radio tuning, weird whistling

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