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  1. #1

    Member Since
    Nov 28, 2010
    Mid 2011 27" iMac power problem
    Hi All,

    I have the above iMac which is an i5 - which seems to have a strange problem in that the Mac works fine, can shut down and restart - no issues - ( except for AHT fault code: 4HDD/30/40000005:SATA(0,0) ) - new hard drive about to be installed with OWC SSD Kit - but only if the mains power lead is left in and with power applied but if the mains power is disconnected - it will not turn back on - but will power back on as normal if left overnight unplugged - suspect iMac power supply maybe or could it be the hard drive ???

    There is a very, very faint click from the bottom right corner of the main unit when it won't power on ??

    Any suggestions or experience would be gratefully appreciated !!

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Welcome to our forums.

    The AHT code indicates a problem with either the hard drive or the SATA cable. Since your iMac is a 2011 model it likely has a Seagate 1 TB hard drive installed. Replacing it with an SSD is a good idea, however, you must compensate for the thermal detection sensor or the fans will go full RPM. The OWC kit should include a jumper cable so that the hard drive heat sensor is bypassed and the fans will operate normally.

    As for the Power Supply problem, have you contacted OWC tech support and asked about it? Your iMac is too old to ask Apple for help but you should be able to get help from OWC.

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