iMac fan issues?

Discussion in 'iMac' started by ugriffin, Feb 14, 2015.

  1. ugriffin macrumors newbie


    May 25, 2011
    Hey everyone,

    Back in October/November 2014, my beautiful late 2013 (16GB RAM, Intel i7, everything maxed out) iMac's fans started behaving very strangely. The fans would spin up to full speed when the machine was doing nothing, Activity Monitor reported 2% CPU load, and iStat reported that temperature readings were fine. More strangely, early in the morning, after the machine was sleeping all night, the fans would spin up all by themselves, spin up, spin down, spin up, and continue until I shut down the machine (this isn't pleasant at 5AM when you're trying to sleep).

    Naturally, I tried a PRAM reset, SMC reset, nothing. I started noting that the problem happened in Windows (gaming partition) as well, which ruled out driver/software issues.

    I've taken the computer to the Apple Store, and they replaced the logic board. When I got it back it turned out that the bluetooth was now broken, so they replaced that. Now that I have it back, the fan is starting to act up again, behaving like before. Anyways, it seems like the computer is malfunctioning completely and it's a real drag.

    An Apple employee once told me that it could potentially be a USB device which is causing the fans to act like this: but my iMac's fans act up when any USB external HD is plugged in: is it true that a USB device could be at fault for my Mac's erratic behaviour?

    I already opened another topic regarding my experience with this iMac in the Apple Store and I was looking for some technical advice on the matter before I take it back, yet again. Is there any way I could personally fix/troubleshoot the issue? I find it suspicious that they've replaced the logic board yet the problem is persisting.

    The problem is particularly acute since my warranty expires in roughly two weeks and I don't want to be stuck with a malfunctioning iMac.

    Thanks in advance. :)
  2. Nismo73 macrumors 6502a

    Jan 4, 2013
  3. ugriffin thread starter macrumors newbie


    May 25, 2011
    I'm considering it, but at the same time once I drop it off again it will be my 7th time going to the Apple Store with this iMac, so I am sort of hoping that if I talk to someone they will extend my warranty a bit. Is that something they'd do?

    In any case, Australian consumer law gives you 2 years of warranty so the situation is, according to the Apple Store employees, not too dire. I'd just ideally like to have it fixed by the time the Apple Limited Warranty expires.

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