Restart leads to no shutdown of OS and excessive Fan but....

Hi everyone,
I hope a mac guru can help me with this little issue...I never restart my mac as im involved in video editing etc. However, sometimes I need to restart due to software updates etc. I have a problem whereby OSX shuts down and the screen goes black, and then the fan goes into overdrive...I mean SERIOUSLY loud! I thought maybe this was cos my G5 is overheating or something, so I left it overnight presuming it would sort itself out and stop the fan when cool...however next morning the fan was still happily sounding like a small helicopter. Is this a known issue? I havent been able to find anything...Is it software or hardware? Everything else on my apple has been exemplary.

Frederick,
I would check out this article, and if you have not done so, now perform items a) and b)
http://discussions.info.apple.com/webx?128@@.68921c2d
Those are the simplest starting points and they might help, certainly can not hurt.
Then I would check out this article:
http://docs.info.apple.com/article.html?artnum=301283
Please note that one of the early steps is a PRAM reset, which will cause you to lose some preference settings. PRAM is described here:
http://docs.info.apple.com/article.html?artnum=86194
If to correct your issue, you must continue in that article beyond the PRAM reset, you will come across the System Management Unit (SMU) reset. A better explanation of the SMU reset is in this article:
http://docs.info.apple.com/article.html?artnum=301733
Note that this article is for purposes of dealing with a second generation iMac, however, you'll note how simple the procedure is, therefore it presents no risk to you to try it anyway - hey, you never know what'll work. Due to its simplicity, I would perform this SMU reset (that probably will do nothing) prior to performing the SMU reset (the proper reset for your model) described in the above article.
If you are interested in understanding a little more about the SMU and how it and the PMU (Power Management Unit) control the fans, check out pages 14-15 and 24-25 of the May 2005 iMac Developer Note
And, to answer your question, it's a software glitch - something has just gotten slightly out of place. If it continues, it would necessitate reinstalling Tiger, but hopefully you won't have to go that far.

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