Previous 1 2 3 Next 61 Replies Latest reply: Nov 9, 2010 5:00 PM by JonnyMortlock
IlMolto Level 1 (5 points)
Hi there,

I've noticed there's a buzzing sound coming from my brand new 2010 Mac Pro if I listen closely from the back. It sounds like an electrical buzz and even though it's only audible from the back of the machine, I'm a little concerned this might get worse and worse over time. I don't remember hearing the same buzzing on my 2005 Power Mac G5. I'm not 100%, but it might be coming from the power supply. Has anyone else experienced this? It's only audible when you listen closely from the back.

If someone could go behind their Mac Pro and listen for a buzzing sound that would be great so I will know whether it's normal or not. Don't get me wrong. The buzzing sound is not annoying in any way as I cannot hear it from where I sit. I'm just concerned that it might lead to something worse or even damage my Mac Pro over time.

Thanks for reading and I hope to hear from somebody soon.



Mac Pro 3.2GHz Quad-Core Intel Xeon "Nehalem" (Mid 2010), Mac OS X (10.6.4), 12GB 1066MHz DDR3 SDRAM
  • Allan Eckert Level 9 (50,721 points)
    My suggestion is take it back to Apple and ask them to check it. This will do two things for you. First, it will give you peace of mind knowing that it has been looked at by experts. Secondly, it document this problem for your Mac with Apple just in case this go bad in the future you will have it recorded that there was a problems.


  • IlMolto Level 1 (5 points)
    Hi Allan,

    Thanks for your advice. I might take it in on the weekend. Hopefully it's nothing. I'll let you know how it goes.


  • Grant Bennet-Alder Level 9 (56,679 points)
    I second Allen's suggestion, based on the following experience:

    My son was having problems with his MacBook. I ran the diagnostic and carefully copied down the exact error message. We took it to the genius bar and started to explain what we had done so far, while the Mac was booting up.

    "Hold on a minute," the genius says, holding the Mac keyboard up to his ear. "You have a bad fan in this thing. That could cause overheating and make the system crash or shut down suddenly. Now what was the problem you were having?"

    Well, we explained, crashing and sudden power down. And it failed the diagnostic. The diagnostic code I meticulously copied down looked up to essentially "You got a bad fan in this thing."

    The geniuses have training and seat-of-the-pants experience on current products that can't be beat. Take advantage of it.
  • Tom Nelson1 Level 4 (2,640 points)
    It may be that your buzzing sound is caused by vibrations of the side door hitting against the case. Try pressing against the side door near where you hear the sound in the back. If the buzz goes away try shutting down, opening the side panel, then carefully reinserting the panel, and locking it in place. Then restart and check for the buzzing sound.

    If the buzzing just changes tones, or won't go away, except when you apply pressure to the panel, you can try the following fix:

    Open the panel up, and place a thin layer of clear tape near where the buzzing sound occurs. Place the tape on the panel where the panel may contact the Mac Pro case. Remember, the panel makes contact not only on the edge, but also around the case frame near the processor tray.

    If that fixes the problem, you can then decide to live with the fix, or see if Apple will do a replacement.

  • progressia Level 1 (10 points)
    Same here, got my 6-core 3.33GHz Mac Pro (2010) just a few days ago and I have the same buzzing sound coming from the back of the power cord behind the Mac Pro. I can only hear it though when i place my ear a few centimeters away from the area. It's concerning me, very much. I will call Apple and have them resolve it if they can. Can't rely on emails for crap.
  • Malcolm Rayfield Level 7 (28,075 points)
    I could be a hard drive. Try shutting down the computer and reseating the drives.

    Are you sing a UPS (Uninterruptible Power Supply)? Some do not generate good sine wave power, which can produce a buzz in the computer.
  • progressia Level 1 (10 points)
    I believe I have restarted and shutdown the computer more than a dozen times these past 5 days since I got the Mac Pro. I don't think that it's a HDD because, like i said, this is coming exactly behind the power cord connected to the power hole/jack behind the Mac Pro. It's like the power hole/jack (not sure if that's correct wording) is defective and not connected 100%.

    No I'm not using a UPS, this is connected DIRECTLY to the wall. I have used that spot for more than a few items and never was there an issue. I'm confident that it's a Mac Pro problem. I'd rather send it back than bite the bullet later on. Thanks for the help.

    Message was edited by: progressia
  • IlMolto Level 1 (5 points)
    I'm on the phone with Apple right now. They've put me on hold to speak with a senior tech. Will let you know what they say.
  • IlMolto Level 1 (5 points)
    First thing he told me was to plug the Mac directly into the wall outlet. I had it plugged into a power board that was also plugged into a surge filter. Exact same thing happens when plugged into the wall. Then he went to the back of the Mac Pro that they had at the office to listen for the buzzing sound. He said he couldn't hear a buzzing sound, however, the place isn't exactly quiet so he couldn't give me an accurate answer. He gave me a number to an Apple repair center in my area and said it would be best to give them a call and get some better advice. I'll see if I have time to call them today.
  • IlMolto Level 1 (5 points)
    Wow! That was a whole lot quicker and easier than calling Apple directly. Got to speak with a person straight away and he answered my question then and there. He said that if the buzzing sound is noticeable from where you sit when you use the Mac, then definitely bring it in, but the buzzing sound is most likely the fans in the power supply that keep it cool. It doesn't necessarily mean that components are failing. I guess that makes sense.


    If you happen to call Apple, please let us know what they say.
  • ferko Level 1 (0 points)
    I have had the same buzzing sound for weeks.
    I opened the side panel and carefully pushed the HDrives one by one in it's bay.
    It was the 4Th bay HDrive spinning vibration. When i pressed it a little bit the buzzing stopped.

    Good luck with this !!!
  • IlMolto Level 1 (5 points)
    Thanks for the info ferko. Definitely going to give that a try.
  • progressia Level 1 (10 points)
    Wow, thank u indeed for sharing that bit of information with us. Well, as u said, I cannot really hear it with my head nearly 1m across from the area when I'm on my desk facing the screen. It is only when I place my head literally a few inches away from the power cord connected to the back of the Mac Pro. I'm surprised though that the senior tech couldn't answer ur question properly though, makes me wonder...

    I did try opening the panel and pushing the empty HDD bays in and it made no difference, can still hear it when my head is near the area.

    Anyway, I will call Apple UK today and ask them for advice on the current situation, along with another issue I've been facing (which is a strange and random pop/crackle sound being heard from my loud-speakers which doesn't happen all the time but happens sometimes. I think it's a soundcard problem, has to be, my speakers r perfect, using it with my iPhone 3GS, MacBook Pro 15" mid2009 and others, not a problem. There is a thread on this i believe it's on the 3rd page).

    Will let u ALL know what Apple tells me once I've given them a call after class today.

    Many thanks to u all.
  • progressia Level 1 (10 points)
    Was on the phone with Apple UK just 10mins ago. The tech rep couldn't give me a straight answer either so he set up a repair appointment for me and will have an Apple Repair Service call me within the next 24-48hrs to arrange a collect&return repair service. I told them about the buzzing sound and in addition, the strange audio pop/crackle sounds i hear from my loudspeakers. He thinks that it could be because of my faulty power cord or maybe the power supply is faulty, he says it could be a possibility that these 2 issues are interlinked. Hopefully I'll get a call in the next day maybe and have my BigMac fixed up.

    WILL inform u all on what happens after I get my Mac Pro back. I HOPE TO GOD THEY FIX IT. Spent too much money on this to see it as one of the things that can't be fixed. Hopefully they won't wipe my HDD.
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