I have a mac pro late 2011 and my fan is very loud

every time i cut my computer on t=my fan seems be be running very fast and it loud.

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
You may need to start it using OPTION D.  Your MBP may have a bad sensor.
Ciao

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    Boilerplate text:
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