Sudden Loud Fan Noise

Discussion in 'iMac' started by Malivar, Nov 24, 2010.

  1. Malivar macrumors member

    Sep 22, 2008
    Today, I got home and turned on my iMac 21.5 inch. On a typical day, I'd here the "BONG" and then everything would be normal. Today, my fans, or something inside the computer, sounded like it was going crazy. I have no idea what's wrong.

    Anyone have any ideas how to resolve this?
  2. jampat macrumors 6502a

    Mar 17, 2008
    How long did the fan stay high? Did the computer eventually boot? Sometimes while installing updates, the fan will run at full speed while the update happens.
  3. Malivar thread starter macrumors member

    Sep 22, 2008
    I'm on the computer right now to see if the fans quiet down... Nothing yet. The fans are STILL high. Hasn't booted, and I installed the new update like, 5 days ago.
  4. JasonR macrumors 6502a


    Nov 11, 2008
    My 27" iMac fans revved up really high while doing a system update (I believe it updated the firmware). Shocked me for a second.
  5. FarSeide macrumors 6502a


    Feb 17, 2008
    Earth Lane
    Run AHT that came with your computer. High Fans often equals one of the sensor gone bad and there are many sensors on the MLB.

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