Fam too loud

Since two days ago my mac pro make a lot of noise. The fans are going too loud, like airplane take off.
I need help i´m worry about it.
Thanks

That Apple technote says there is no SMC-RST button which is a real shame as it would make life easier. I don't think a minute can really bleed or reset an SMC. Overnight may or may not.
On older G4 MDD and G5, to bleed any juice, not only unplug, but remove RAM and battery, reset the PMU/SMU and try booting with it unplugged would revive a system that would not boot when nothing worked.
You could try the "command option PR" routine to zap pram/nvram through multiple reboots from cold start too.
I shutdown at night, and turn off the UPS so there isn't any juice going in to anything. But I don't think that resets the system. And when I had a problem the only way to clear it was on older Mac Pro to use SMC_RST.
What I would do though, is boost the fans to run @ 800-850 rpm (one fan won't get boosted though) using SMCFANCONTROL 2.1.2 which can be downloaded off
http://www.macupdate.com
The other thing is to monitor temps. iStatPro, Hardware Monitor are good, and make sure the room isn't getting warm (I have to turn down heat in winter as room heats up with the Mac on, and cool it more like now, as it tends to add 4ºF ).
The fans are suppose to respond to thermal sensors and nvram settings. It tends to wait too long to respond to changes. Also, sometimes a plist that governs power management can cause problems. Most drastic route: Archive Install or reinstall (maybe to another drive either internal or FW).
When you look at fan speed, insure that it is not graphics. I assume you are talking about 1500+ rpm (1000 is only barely audible). So good to run Hardware Monitor to help diagnose what is happening.
Also, if you have not, boot from your OEM DVD with 'd' and run Apple Hardware Test. Click on Extended, and command + L for looping. That was the first time I heard fans run full bore (2500 rpm?) and scared me not knowing what was happening.
Someone thought they saw a SMC button behind the top Riser in 2008, but that was never confirmed, and their photo showing it was pulled down. Shame.
Also, make sure your power cable is okay and plugged in - I put wrong cable on once and it auto booted and fans ran wild.
Otherwise, it should be looked at by Apple.

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