iMac 24" (early 2009) shuts down randomly

Discussion in 'iMac' started by JorgeVazquez, Nov 16, 2014.

  1. JorgeVazquez, Nov 16, 2014
    Last edited: Nov 16, 2014

    JorgeVazquez macrumors newbie

    Joined:
    Nov 16, 2014
    Location:
    Vigo, Spain
    #1
    Hi! I was reading this forum for years and now... i registered because a problem (ouch!) ... I wonder if someone can help.... :)

    My iMac shuts down randomly since i installed Yosemite. It always happen when i'm doing something, sometimes opening Safari, sometimes launching an App... the system doesn't shut down if you don't touch it. I made my investigations....

    - I re-install Mavericks and Snow Leopard and the problem remains. So is not related with Yosemite at all.
    - Apple Hardware Test (the long one) says there's no problem with any piece of hardware (the iMac didn't shuts down while performing the test).
    - There's nothing plugged into the mac, so the problem is not related with peripherals.
    - There's no pattern into the system log. The last messages recorded before the system shuts down are always different (no errors).
    - The temperature registered in all sensors are fine, all the fans are working properly.
    - I have an UPS unit so the current should be nice and protected.

    So... Can all the shuts down be only fault of the Power Supply Unit? I can switch on the mac after the shut down without any problem. There's a way to test the PSU before i pay for a new one (expensive part!)? Any idea of something different causing all the trouble?

    Thanks!! ;)
     
  2. aicul macrumors 6502a

    Joined:
    Jun 20, 2007
    Location:
    no cars, only boats
    #2
    Maybe a silly suggestion, but did you check that the power cable is well set on the iMac (not on the UPS).
     
  3. JorgeVazquez thread starter macrumors newbie

    Joined:
    Nov 16, 2014
    Location:
    Vigo, Spain
    #4
    Yes, the cable is well set. I can switch on again without touching it.

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    I did it, nothings change :(
     

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