iMac Optical Drive Fan Going Crazy After Replacing it With SSD

Discussion in 'iMac' started by jtw11195, Jun 11, 2013.

  1. jtw11195 macrumors newbie

    May 5, 2011
    Today I removed the optical drive from my late 2009 iMac and installed an SSD in its place. Everything works perfectly, except for one optical drive fan goes crazy when I turn the iMac on. It goes to full blast and it sounds like my computer will blast off into space at any time. I'm aware that this is a common issue when replacing/upgrading hard drives, and so I did some research and found an app called SSD Fan Control that fixed the problem for the most part.

    In a nutshell, the fan runs at normal speed and is quiet when I'm logged in and actually using the computer, thanks to SSD Fan Control. However, when I turn the iMac on and it's at the white boot-up screen with the Apple logo, the fan goes up to full blast. Once the computer logs in, the fan quiets down because SSD Fan Control is set to launch at login.

    I was wondering if there's a way to make it so that the fan is quiet at the boot screen's quite annoying turning my iMac on and hearing that obnoxiously loud whirring sound as it's booting up. Is it possible, or can it just be controlled while I'm actually logged in?

    Any help is greatly appreciated! :D
  2. apedance macrumors member

    Sep 1, 2012


    I don't know if this will work on your machine with your replaced component.

    But why not give it a try.

    Download the Demo of iStats. ->

    Set the optical drive fan to a "normal" speed and try/reboot it again.

    My iMac (late 2012) does keep the fan speed when I reboot. Even when I boot into Windows via Bootcamp.
  3. dangerly macrumors regular

    Oct 27, 2009
    Few months ago i replaced the optical drive with a SSD in my iMac (2009).
    To prevent the fan to go crazy i attached the optical drive thermal sensor to the HDD (so now the HDD has two thermal sensors attached). This way i have not had any problems with the optical drive fan going crazy and the temperatures inside the iMac are all within normal ranges, even when i play games that make CPU-HDD-GPU work hard.
  4. jtw11195 thread starter macrumors newbie

    May 5, 2011
    That didn't work :( The fan still runs at full speed at the boot screen
  5. bmcgrath macrumors 65816


    Oct 5, 2006
    London, United Kingdom
    I think if you download smc fan control you have override the fan back to normal levels.
  6. apedance macrumors member

    Sep 1, 2012

    I guess you have to open your iMac againg :/

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