Sleeping G5 Spools Fans until it sounds like a Boeing

Hi all,
I recently received my dad's old work computer as a Christmas gift. It was his main tool for ~3 years, and lived in his office within a woodworking shop (lots of fine dust, lots of serious drafting and rendering usage). Mind you, dad knows his computers, and treated it very well.
Since before it passed into my hands, the computer has begun struggling with fan speed. When running relatively light stuff (youtube vids, loading email, etc.) the fans will speed up and slow down in a seemingly random pattern.
vroooooom
10 seconds of normal fan noise
vrrroooooooooommmmm!!!!
10 minutes of normal fan noise
vrooom
1 minute of normal fan noise
vrrrrroooooooommmmmmmmmmmmmmmm
Although the noise is disconcerting, it doesn't seem to conicide with any decrease in actual computer performance.
The real problem occurs whenever it goes to sleep. At that time the fans spool up, and spool up, and continue to spool up until they are running at what I imagine must be the maximum speed. They will then stay at that speed indefinitely, and can only be stopped by holding the power switch to force the machine off, as it stops responding to normal attempts to wake it up.
I have the option of taking it to a shop, but would like to ask here first. The specs are:
Model Name: Power Mac G5
Model Identifier Power Mac 7,3
Processor Name: PowerPC G5 (3.1)
Processor Speed: 2.7 GHz
Number of CPUs: 2
L2 Cache (per CPU): 512 KB
Memory: 8GB
Bus Speed: 1.35 GHz
Boot ROM Version: 5.2.4f1
Built-In Sound Card: Texas Instruments TAS3004
ATI Radeon 9650 AGP (255MB)
Added USB Slots: pcie55,2928
Pioneer DVD-RW-109 (Revision A912, Protocol ATAPI)
I believe this is a "late 2005", though I'm still a little unclear where the dividing line lies.
Thank you very much!
Message was edited by: Gorf37

PowerMac G5 owners hang out over on their own forum, this is Intel Mac Pro that came out post G5
http://discussions.apple.com/category.jspa?categoryID=108
I'd want to look at and for problems with the liquid cooling; dust build up - really open up and take apart some. And look at some of the guides and articles.
Then monitor fans and temps; maybe reset the SMU.
Also, run the CD with Apple Hardware Test.
The trouble with forced shutdown... the disk directory may be left damaged state.

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