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

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    27" iMac (Late 2009)
    3.06GHz Core 2 Duo
    A1312 \ EMC 2309 \ MB952LL/A


    PROBLEM:

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

    STEPS TAKEN:

    • 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 VIP Member

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    Hi,

    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.
    http://support.apple.com/kb/HT1767
     
    oldscribe, Apr 19, 2013
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