Buzzing sound

Hello everybody. Recently i bought mac pro ( from this auction: http://www.ebay.co.uk/itm/201136982439 ) and on the beginning was perfect. Yesterday i had problem with fans ( my brother was unzipping zpaq file and set program to use all 8 cores, and computer has turned on all fans on 100%, and the noise was terrible. After that situation, the fans. started working on 100% all the time, even when i was doing nothing on computer - but it stopped, while i unplug power cable, so now is ok). But today again.. It is buzzing again (different buzzing style), (i`ve record a video : http://youtu.be/vuxeHMSpYlE ), and computer is heating alot. I shutted it down, because i am afraid to not burn any parts inside, but could anyone help me and tell me, what is wrong with this?
Thanks for all responds

Hello,
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.bresink.com/osx/TemperatureMonitor.html
What are the high temps?

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**Click the KUDOS star on the left to say 'Thanks'**
Please mark a reply "ACCEPTED AS SOLUTION" if it solved your problem, so others can find it.
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Buzzing sound

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