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  1. #1

    Member Since
    Nov 08, 2013
    16Gb iPhone4S, 64Gb WiFi iPad Air, iMac 21.5
    iMac Power shutdown
    Late 2013 21" iMac. Twice now I have found the computer shut down from sleep mode. No response to power on via power switch. Both occasions removing the power cord and refitting it has worked and the power switch works normally. Very strange. Any ideas/suggestions please. Am I missing something obvious as a Mac newbie?

  2. #2

    MYmacROX's Avatar
    Member Since
    Mar 17, 2009
    2008 15" MBP Yosemite, 2012 21.5" iMac Yosemite
    Normally, I would suggest looking at the power managing settings in System Preferences to see if it is set to shut down after a certain amount of time.
    However, the thing about the power cord makes me wonder if either there's something wrong with the outlet or with the power cord itself or possibly the part inside the iMac that the cord plugs into. Can you try plugging it into a different outlet somewhere else in the house and see if the same thing happens again?

    If you purchased it new or refurbished, it is still under 12 month warranty Apple Care.
    64GB iPhone 6, 64GB iPad Air 2.

    Reminder: Please include your Mac's specs. This will make it much easier for the other members to assist you.

  3. #3

    Member Since
    Nov 08, 2013
    16Gb iPhone4S, 64Gb WiFi iPad Air, iMac 21.5
    Thanks for your response. I would expect the power switch to operate normally after a power management shutdown. However the power button is completely dead.
    I think it's likely to be a hardware failure, but I wanted to check if anyone had a similar problem or if there was something I was overlooking.
    This is my first Mac after years of Windows machines with never a failure. I was hoping to keep up my success rate!

  4. #4

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, OS X.13.4
    It will be under warranty so make an appointment and take it back. Never see the problem you describe and it may be a dodgy lead. Personally use an UPS particularly in a tropical environment with thunderstorms.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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