White Noise when using ProTools

I have a PwrMac G5/2 CPU/ 2 gig Pwr PC.
I use ProTools LE 7.1.1 with an Mbox-1
When I load ProTools, I get a high pitched noise coming from the Mac, and it gets picked up in my recordings. This noise only starts when I load the ProTools App. If I close the app, the noise stops. It sounds like it's coming from the left side of the Mac, just above the power button on the front.
There has been a lot of discussion about this on the Digidesign forums, but no real explination or fix. I was just wondering if anyone on this forum has run across this and what the results were.
Ray

The noise I can hear in my speakers and headphones. I did some further experimenting last night and bounced a couple of recorded sessions in ProTools to disk. When I listen to the bounced versions, I don't hear the noise, so I surmize that the noise isn't getting into the recorded tracks. This is the first time I've bounced tracks, so up until now I've only been listening to playback from ProTools.
I also noticed that when I have my headphones plugged into the Mbox, and close ProTools, the white noise changes to a pulsed beeping sound, almost like a stopwatch. This is also a symptomatic sound reported on the Digidesign forums.
Ray

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