X1900 and Mac Pro Fan problems

I just got my new system today.
I transferred all my data from my old G4 tower to my new system.. and all was good. I deleted the data from my old G4 as I am going to sell it soon.
Alas, when I go to try out my fancy smancy new grfx card... I fire up WoW... and futz around for a bit..
the fans are going nutso.. i don't know if it is the ATI card or the system fans... I can't forsee WoW pushing the ATI hardware that much to cause such a whine in the fans..
Anyways, I quit out of WoW.. and fired up the Quake 4 demo I had downloaded. Part way through the screen goes black, as if it went into sleep mode.
Can't do anything.. the fans are screaming so loudly.. so I hold the power button to shut down. She won't start up after this.. just ramps the fans up and the screen stays black.
I unplugged everything. Then plugged it all back in.. and as soon as I plug in my power cable.. the comp restarts itself...
what is going on here? I don't know if this is a power issue or a heat problem.. or what...
I dread the thought of having to put all 80 gigs of that data back onto my G4 and take this sucker back to the apple store..
But I don't want a computer that flips out and sens its fans speeding for certain death...
any thoughts?
Mac Pro 2.66 Mac OS X (10.4.8)

First reset the System Management Controller…
http://docs.info.apple.com/article.html?artnum=304123
… and immediate upon booting PRAM and NVRAM…
http://docs.info.apple.com/article.html?artnum=2238
… three consecutive times and see if it helps. Additionally check to see that the graphics card is seated properly.

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