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Message: <blockquote data-quote="pmj" data-source="post: 43545">I just received my new dual G5 2.5 ghz and while I love how fast it is... there is an odd "revving" sound that happens on and off, randomly, while I use the computer...  I've never heard this sound on any system I've used before -- it's not a fan (I can hear them go on and off -- the constant fan is fairly quiet) and it's not the DVD/CD drive...  A friend thinks it's the pump that circulates the liquid 'coolant' that surrounds the chips in this model...  Anyone have any idea what it might be?p.s. I ran the hardware test and everything seems to be working fine -- I'm on OS 10.3.4 etc.  p.s.s. It just went off again as I write this -- it sounds like a wind-up toy!  Could it just be the way this thing sounds???</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?