No ethernet on 27" iMac (Late 2009) has ne baffled. Need expert advice.

Discussion in 'Mac Desktops' started by Apple, Apr 19, 2013.

  1. Apple

    Apple New Member

    Apr 19, 2013
    Likes Received:
    27" iMac (Late 2009)
    3.06GHz Core 2 Duo
    A1312 \ EMC 2309 \ MB952LL/A


    • This iMac won't recognize that an Ethernet cable and says it is unplugged when it is indeed plugged in.


    • Passes Apple Hardware Test with flying colors.
    • Reset PRAM, SMC
    • Tried different cables and modems.
    • Fresh copy of Snow Leopard installed.
    • Inspected Ethernet port for damage.
    • Inspected logic board for blown capacitors, ect...
    • Repeatedly hitting it with a hammer. :eek:

    I know the obvious answer is to replace the logic board, but I'm trying to figure out where the failure is so I can possibly resolder and/or replace that component. The jack looks fine. :confused:

    The only clue I have is that it hangs on the hardware test at the "Ethernet Controller (test #13) - PHY 10 Loopback Test" for about 2 minutes and then it passes.

    Some expert advice would be most welcome. :)
    Apple, Apr 19, 2013
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  2. Apple

    oldscribe New Member

    Nov 14, 2012
    Likes Received:
    Geneve & UK

    I would start by resetting the SMU (System Management Unit) have a look at this link.
    Note the last paragraph re original iMac G5,and its logic board reset button.
    oldscribe, Apr 19, 2013
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