iMac 20 inch Fans blow at full speed after HDD Upgrade

Discussion in 'iMac' started by pillaishaun, Oct 4, 2011.

  1. pillaishaun macrumors newbie

    Oct 4, 2011
    Hi all. Here's my story

    Removed Hitachi HDD from my iMac 20inch(Early 2009) , installed Seagate Barracuda 1TB. I have heard that I should stick to the same brand but its a bit late for that now. The drive works well.

    Problem is : Fans run at full speed from the time I turn the computer on and only stops when I shut down my Mac or put it to sleep.

    I tried resetting PRAM , resetting SMC , downloaded and tried HDD fan control , ran the smc fan control in Terminal with no luck.

    I tried smc fan control and it doesn't allow me to change the ODD speed(Which shows a minimum value of 5100rpm).

    My smc fan control values are ODD 5100rpm , HDD 1419 , CPU 3847

    I have attached my iStat values here.

    I have heard of people removing the temp sensor cable to fix the problem.

    My question is , how do I do that? Which sensor cable should I remove?

    Attached Files:

  2. Sackvillenb macrumors 6502a


    Mar 1, 2011
    Canada! \m/
    I'm not sure about removing the temp sensor cable, but I'm pretty sure that all the main temperature sensors make the fans run at full speed if they are not detecting a proper connection... so maybe one of your sensor cables is simply loose or improperly connected?
  3. pillaishaun thread starter macrumors newbie

    Oct 4, 2011
    I hope thats the problem. Maybe I should open up the Mac tomorrow and give it a try. Thanks for the advice.

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