Mac Pro, Fans fire up full speed for no reason - randomly!

So, here is another fan issue with the Mac Pro, and I am at a loss. Perhaps someone can help me with this one. I have a Mac Pro I bought in mid '07, dual 2.66 GHz. I have 2 7300GT video cards, which don't have fans of their own to be making the noise...
The computer, when left doing nothing will ramp up full speed for God knows what reason. There is usually almost nothing open for applications, and no major processes running. Menu Meters shows the processor load to be minimal, not a heavy load that would cause heat-issues from processors working hard.
There is really no way to get the fans to slow back down either. The machine is still fully functional, I can open, close or work on software, so nothing is "frozen". I have quit all applications to no avail. The machine will not go to sleep when this occurs, and half the time will not power off using the shut down menu selection either; requiring a forced shut down. Upon reboot, it is fine... (until it decides once again to take off).
This is not the fans roaring when waking from sleep issue, I have had that one as well (bad ram).
Thoughts?

Last night, after I shut down, my fans slowly ramped up into high gear. They went to full rotation, and I let it whirr for four or five minutes, thinking it would shut itself off. It never did, so I just pulled the plug on the CPU. I plugged it back in five seconds later, and it stayed shut down after that.
It's been working more or less flawlessly other than this... most stable Mac I've ever had.

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