Computer freezes, then a low-volume, high pitch sound

Hello there,
My trusty 2002 MDD is randomly freezing on me for the 1st time! Disk Warrior nor Disk Utility form external boot-ups detect anything wrong. Thus, it doesn't seem to be a hard drive issue. Memory status on System Profiler checks OK.
Once the beach ball appears I can't do anything but press the power button to shut it down. I've noticed that while frozen a very low-volume, high pitch sound can be heard. ???
Thanks a lot for any feedback that you may provide,
Jacobo

Hatter,
Thanks for the prompt reply. Like you proposed, I've started from my FW drive (not after a freeze though) and everything drive-related checks OK.
Yes, my video card (Radeon 9800) does have a fan. I've though about this and the PSU as well. The latter is the quieter, less powerful one.
My drives are less than a year old and seem to be OK.
I’ve run Applejack (w/ memory check) and all is good.
Can the Apple Diagnostic CD pinpoint any of these issues?
My MDD has been incredible when it comes to reliability. She has not given me ANY problems whatsoever while stressed to its limits.
Thanks again for your time,
Jacobo

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