G5 Fans going berserk with Leopard

I installed (clean install) Leopard yesterday on my G5 PPC. All went really well and I put the machine to sleep for the night.
When I went into my office this morning it had woken up at the fans were going berserk, never heard them so loud. It was unresponsive and I had to force quit by holding down the button on the front.
Anyone know what is causing it or having a similar problem?
Thanks

There are many threads on this issue regarding processor overloading and overheating with Macbooks. Here is one thread:
http://discussions.apple.com/thread.jspa?messageID=5718200&#5718200
My experience:
it seems to have something to do with some sort of excessive processor load. I have MenuMeter installed, and it shows one of the processors running flat out at 100%, and then the load switches to the other processor. This would certainly create some heat. Also, open Activity Monitor, click on the CPU tab, and look at the CPU usage LED display at the bottom and you will see the full processor load switching from one side to another. Interestingly though, Activity Monitor doesn't show any processes that are taking up a significant amount of CPU. I have the problem even after a restart before starting any applications, and with no startup items enabled. This one has me puzzled, but the other symptoms noted in this thread sound similar.
By the way, I get the same overload/overheating problem with only a newly created user and nothing else running. I am not running Time Machine and Spotlight is not indexing.
This is a serious problem and due to the load, the battery time on my MBP is now limited to less than an hour on a full charge. I am also concerned that the constant heat load will not be good for my MBP.
The only solution I see right now until Apple fixes this problem with an update: revert back to 10.4.10. Since I run my MBP on battery during frequent flights, my MBP is for all practical purposes unusable with 10.5. Needless to say, I am disappointed that I have shelled out the money for Leopard and cannot use it.

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