G5 makes wierd noise

My G5 started making a strange noise about 3 months ago which seems to relate everytime something significant moves on the screen. It is worst whilst the screen saver is on, everytime the image changes the noise happens. The noise only happens whilst something is changing or moving on screen. (It is not one of the 3 noises posted on this site as sound files).
Any help appreciated as my warranty runs out next week.
Dual 1.8 G5, 2.5G ram   Mac OS X (10.4.6)   apple cinema display 20"

My G5 has made a noise when things happen since I got it. Every time I restart the thing (which thankfully in OS X is not often) I have to go into the Processor control panel and turn off processor napping. Otherwise if "napping" is left on, it'll make that weird irritating noise whenever I do anything even moderately intensive.
If you don't have the Processor system preference, you'll have to get it via the CHUD tools from apple downloads. During a couple of system updates, the version I had of Processor was disabled.. so it was a struggle to find the most current version of CHUD tools to get a version of Processor that worked with the OS version. It would be much nicer if Apple just included it in its OS updates.

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