HT1338 Problem: My Mac Pro is heating and the fan produce a lot of noise, what shall I do? I got the new Montain Lion

Dear best Users,
What shall I do? My Mac Pro 2.53 GHz Intel Core 2 Duo/OS X 10.8 13-inch 2009= Is heating and producing a lot of noise with the internal Fan.
Best,
Dario van der Lündin

If you can, open Activity Monitor and see what's using up all the %CPU.
If its kernel_task, shutdown immediately and do a PRAM reset, like this:
1. Power down the machine.
2. Locate the following keys on your keyboard in preparation for Step 4:
‘command’ – ‘option’ – ‘P’ – ‘R’
3. Press the ‘power on’ button.
4. Immediately – and before the grey screen appears – hold down ‘command-option-P-R’ all together.
5. Keep them held down until you’ve heard the start-up chime twice. After you release them you should hear it again, and hopefully your Mac will boot up as it should and with the kernel_task process back to normal.
If that's not it, try quitting whatever the process is by selecting it in the Activity monitor window, then 'Quit' in the task bar. If the process refuses to quit, post back with the name of the process.

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Hi All
I have a 2009 Mac Pro with dual processors, this has been a great system until recently it started to shut itself down after around 20 minutes of use, I tracked this to a processsor getting too hot and shutting down. I air dusted the unit and replaced increased the fan speeds. Now the mac pro will not boot. As soon as I insert the power the motherboard flashes red and will not power up the system. Is there something I can do myself? Can I clear the mac bios? Any thoughts or advice would be appreaciated.
Cheers

thanks Hatter, I appreciate your advice.
The system is running 10.6.2, or was running.
I tried the SMC reset:
SMC Reset using "unplug, hold power for 5, release, plug in
SMC Reset using "unplug, hold power button, plug in, release
No change either way.
What happens is, watching with the case open, when I plug the power cord in and two red lights flash on the motherboard "CPU A" and CPU B". And nothing happens from there, no fans, nothing.
I wil try to remove the heatsink if I can find the right tool.
Do you have any other thoughts?

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Open activity Monitor and see if you have a 'runaway application'
http://support.apple.com/kb/TS1473
Try a SMC reset:
http://support.apple.com/kb/HT3964
Run an Apple Hardware Test:
http://support.apple.com/kb/ht1509
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@ Hatter
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@ Grant
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HT1338 Problem: My Mac Pro is heating and the fan produce a lot of noise, what shall I do? I got the new Montain Lion

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