Mac book pro makes noise like a lawn mower

every now and then my mac book pro starts to make a noise that resembles the sound of a lawn mower in the neighborhood coming through the open window.this lasts about 5 minutes,then the book is back to normal.
can i stop this somehow?do i have to be concerned?

You might download the widget "iStatPro" from the Apple site and look at it when the noise occurs. See what your fans are doing, and see if you can associate the noise with the fans and the internal temperature of your computer. The fans in my MBP idle at around 2000 RPM. If yours do the same, run at about the same speed, and then speed up for a while if the temperature goes up, then they are probably working as they should. You could post back with some actual speeds and temperatures if you want to verify that what you are experiencing is normal.
If, however, the fans are operating at very different speeds, or one isn't operating at all and the other is going very fast, then you could have a problem with either a fan or a thermal sensor. If you think you might, run the Apple Hardware Test--it will give you an error message if there is a problem.
If it turns out that the noise is not associated with fan speed, then I would start to worry about the possibility that it might be coming from the hard drive, and back up all your data ASAP. And post back or call Apple if you're under warranty.
Good luck!

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Mac book pro makes noise like a lawn mower

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