Strange trackpad noise observation

Discussion in 'MacBook' started by Skeletal-dæmon, Jun 6, 2009.

  1. Skeletal-dæmon macrumors 6502

    Apr 27, 2008
    This isn't so much a problem as something I have just noticed. Everyone in the house is asleep, and for once I don't have headphones on.

    When I use two-finger scrolling on my BlackBook, there is a strange... almost purring noise from my machine. It's extremely quiet, and I can only pinpoint it to the kinda under-keyboard-towards-hinge area. It is loudest when I scroll on pages with a lot of dark/light alternation on the page, and quietest on plain light pages.

    It really is quite odd. Am I making my Mac purr by scrolling through all my regular webcomics? :confused:
  2. RiCEADDiCTBOY macrumors 6502a


    Dec 26, 2007
    i'm going to take a wild guess and
  3. Skeletal-dæmon thread starter macrumors 6502

    Apr 27, 2008
    Nope, SMC doesn't show any speed variation, and I don't think its a vibration at all, just this odd little 'prrrrrrrr' noise.
  4. retroneo macrumors 6502a

    Apr 22, 2005
    It's the power supply making different sounds when there is different levels of load.

    Scrolling uses a little more power and you'll sometimes hear the components vibrate and make different sounds.

    There's an awesome article by and ex-intel worker who detailed it in depth. I'll see if I can find it.
  5. RiCEADDiCTBOY macrumors 6502a


    Dec 26, 2007
    that was my next guess. ;)
  6. NewMacbookPlz macrumors 68040


    Sep 28, 2008
    That's crazy! :eek:

    Nothing like that on my UMB thankfully, heh...

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