Buzzing noise

Discussion in 'MacBook Pro' started by GuitarMangler, Jan 20, 2011.

  1. GuitarMangler macrumors newbie

    Jan 20, 2011
    Hello, I have a 2007 Mac Book Pro running all of the latest software. However, recently I have been hearing very loud buzzing noises that sounds like a swarm of bees coming from the back left of my computer right near the speakers. I'm fairly certain that it is either the hard drive or the fan because I don't know of any other parts moving fast enough to make a buzzing noise in that area. It had been happening usually once or twice per week originally a simple reboot used to do the trick, but since the beginning of today no amount of restarting seems to fix it.. In fact it is even buzzing right now while I type this message. My warranty expired a while ago and I don't want a new computer so if there is anything I can do to fix this that would be great. If not, I can take it to the apple store and see what they can do. So any help is appreciated.


    Edit: Two more things -

    1.) Closing and opening my computer fixes the problems for 30 seconds to a minute until it starts back up again.

    2.) iStat Pro says that my right fan is rotating usually between 6 and 8 times faster than the left fan while it is buzzing. The left fan is at about 600rpm while the right fan is usually at 3,000-5,000. However, for the 30 or so seconds while my computer is back to normal they even out at about 3,000rpm each.
  2. Animalk macrumors 6502

    May 27, 2007
    Montreal Canada
    You've pretty much answered your own question. The left fan is dying or being obstructed.

    You can try to find a fan on ebay or some mac parts reseller and install it yourself. Look at the guides on for logic board replacement to see how to get to the fans.

    Or take it to apple store and see how much they want.

    good luck.
  3. GuitarMangler thread starter macrumors newbie

    Jan 20, 2011
    Thanks for the help!

    What do you think could have caused it? I noticed that it started happening when my laptop was cold so maybe the metal started to contract and the fan started scraping against it which then caused further damage, but that still doesn't explain why the other fan is perfectly fine, why it is only buzzing some of the time, and why there is such a difference in speed between the two fans.

    Any other help would be greatly appreciated!
  4. greytmom macrumors 68040


    Jun 23, 2010
    Mine was dust in the fan. They blew it out, and it was fine.

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