Shuts Down then fans go wild!

Every day my computer shuts down out of the blue and the fans go to full speed right after.
No metter what I'm doing, it goes off (even with the computer sleeping).
When I try to turn it on again, it sarts running for 2 seconds and it goes off even before I hear the chimes sound. I reset the SMC, turned on the air conditioning... and nothing works.
After a few hours I'm able to turn it on again, but after a few minutes everything happens again. It goes off and just won't work unless I wait a another few hours.
I'm at a 20 degrees celsius ambient.
My EFI and SMC are updated!
I've tried replacing my RAM modules, and it did not work.
And even tried connecting the computer to a nobreak and to differents outlets.
What could be the reason?
My Machine profile:
Mac Pro (octocore - 2x (quad 2.8) - Early 2008)
6G of RAM
Thanks!

Things I would do:
• Reset PRAM - hold command-option-P-R during startup until the machine makes a second startup chime
• Unplug everything connected to the machine and hold the power button for 10 seconds.
• Experiment running the machine with various devices unplugged, in an attempt to isolate potential hardware conflict.
*Could you please provide greater detail about how the computer "shuts down?" Is this a legitimate-looking shut down procedure, where the machine quits everything and goes to the blue screen, or does it click off immediately? I'm confused about how the fans run full "right after." Do they go to full gradually, or immediately? Please, try to explain what happens, step by step.*
• If temperature sensors give a reading that exceeds the maximum allowable temperature for operation, the machine will refuse to start.
• If the machine quits everything and goes to blue screen, as if you told it to shut down, that sounds to me like a software issue.
• If the power light stays lit and the fans run full speed, I'd say you may have experienced a crash.*
• If the fan speed builds gradually to full, I would suspect increased temperature or faulty temperature sensor(s) readings telling the machine it is getting too hot.
• But if fan speeds go to full immediately, I'd be more inclined to diagnose the crash of a critical system.
*I have sometimes seen some of the PowerMac G5s at my school become unresponsive and run the fans full speed until the power button is held, but I wouldn't say these machines "shut down," I would imagine that they had crashed badly. Unfortunately, I have never seen what happens to these machines right before this occurs, because it never seems to happen during actual operation, only after the user has stepped away and the display goes to sleep. I'm also not sure I've ever seen this happen on an Intel-based Mac. And I never expect fans to run after the machine is actually shut down.
*Has anyone else experienced the runaway fan problem on an Intel-based Mac?*

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