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  1. #1
    iMac Suddenly the internal fan is very loud

    Member Since
    May 26, 2011
    Posts
    2
    iMac Suddenly the internal fan is very loud
    We did have a lightning storm last night. Prior to that I unplugged the computer and there were no lightning strikes nearby. This morning the internal fan is much louder, pretty obnoxious in fact.
    Nothing else seems wrong.

    Any ideas? This is a relatively new iMac 27inch so I might lug it up to the apple store.

    Mookiedog

  2. #2
    iMac Suddenly the internal fan is very loud
    Buzzard2010's Avatar
    Member Since
    Oct 22, 2010
    Location
    Bretforton, Worcestershire
    Posts
    2,571
    Specs:
    MacBook Pro 15" 2014, 2.2GHz i7, 16GB RAM, 250GB SSD, OSX 10.9.5 - iPhone 5s 16gb
    Welcome to Mac-Forums mookiedog
    Have you tried restarting the iMac since the problem occurred? Also does the fan keep spinning fast and loud or does it slow after a while?

    Also if you could post your mac specs (year/model) and OS version (at a guess 10.6 but you never know )

    Cheers

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
    May 2011
    Nominated: March 2011 & April 2011

  3. #3
    iMac Suddenly the internal fan is very loud

    Member Since
    May 26, 2011
    Posts
    2
    nooisy fan
    I unplugged the computer, waited and replugged it back in.

    All is well. I think i will call applecare to find out what happened though.
    Who knows.

  4. #4
    iMac Suddenly the internal fan is very loud
    Buzzard2010's Avatar
    Member Since
    Oct 22, 2010
    Location
    Bretforton, Worcestershire
    Posts
    2,571
    Specs:
    MacBook Pro 15" 2014, 2.2GHz i7, 16GB RAM, 250GB SSD, OSX 10.9.5 - iPhone 5s 16gb
    Glad it is sorted now though!

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
    May 2011
    Nominated: March 2011 & April 2011

  5. #5
    iMac Suddenly the internal fan is very loud

    Member Since
    May 05, 2011
    Posts
    72
    Install a fan speed monitoring app, there's one that sits on the top menu bar, iStat menus gives you all three fans (3 on my iMac)!
    or widget iStat, you should see the speed increase when the noise increases.
    Plus lots of other info.

    v1.3
    http://www.brothersoft.com/istat-menus-275403.html
    or v 2.0
    http://mac.brothersoft.com/istat-men...-download.html


    Usually the fan(s) speed up when the iMac needs a bit of extra cooling, quite scary the first time you hear it.

    Normal speed is around 1,000 rpm for all fans.

    When you unplugged and waited, the iMac cooled down.
     iMac 21.5" 2.5 GHz Intel Core i5 OSX 10.8.3

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