mag safe buzzing when scrolling, is that normal?

Discussion in 'MacBook Pro' started by edwardjulio, Apr 14, 2015.

  1. edwardjulio macrumors newbie

    Dec 7, 2014
    I am working in a very quite environment, I noticed that my magsafe adaptor buzzes when I scroll on a page, can be a pdf document, can be a webpage on safari. its funny because it only buzzes or makes a high pitch noise when I scroll a page. is it normal? is it dangerous?
  2. Samuelsan2001 macrumors 604

    Oct 24, 2013
    It doesn't sound normal to me

    It really shouldn't but it may be due to a lack of earthing depending on where you are using your mac...

    No idea if dangerous..
  3. rugmankc macrumors 68000


    Sep 24, 2014
    Never heard that on mine--don't see it as normal--
  4. cruisin macrumors 6502a


    Apr 1, 2014
    Earthing should not matter as the brick has a double insulated logo and doesn't use an earthing pin (in North America at least) unless you use the extension. So I doubt its strictly necessary.

    Have you tried a different outlet, preferably outside of your home (coffee place, friends house) to see if anything changed?

    My machine makes faint chirps occasionally, almost like a mechanical hard drive. It doesn't clearly have one, but the faint noise has happened since the start and only noticeable in a quiet room. Hasn't affected me yet.
  5. ZBoater macrumors G3


    Jul 2, 2007
    Sunny Florida
    Sounds like a cheap Chinese knock off adapter...
  6. Samuelsan2001 macrumors 604

    Oct 24, 2013
    Use the extension

    This will often make it go away.

    In the UK all electronics must be earthed....

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