Imac startup long beep problem

Discussion in 'iMac' started by Ramonlsousa, Jul 23, 2017.

  1. Ramonlsousa macrumors newbie

    Joined:
    Jul 23, 2017
    #1
    Hi to every one.
    I have a late 2012 imac i7 32gb ram (owc) that I accidentally turn off from the multiplug outlet. Now the imac does not boot, black lcd screen. If I press the power button the external usb hard drive power on, fan power on, long beep (silent of 5 second) long beep again.
    Long beep indicates no ram install. Replace ram with original one that had them (8gb) and same problem.

    Logic board has 4 led light ( 1 and 2 led light on green) 3 and 4 do not light up.
    This is been verified with lcd off, I reconect lcd but logic board 3 and 4 light never light on.

    I think I have a bad logic board because I beleive the power supply working.
    1 led=power supply has power
    2 led = I press start button logic board has power

    The power supply has a flex cable that goes from power supply to logic board next to rams, maybe the power supply does not send power to rams though the flex cable to rams and thats why logic board does not recognise rams install. Just gesing.
    Can someone help me?
     
  2. nambuccaheadsau macrumors 65816

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #2
    Unplug everything, including from the power mains, and leave for half an hour, re-connect and see if there is any boot.
     
  3. Ramonlsousa thread starter macrumors newbie

    Joined:
    Jul 23, 2017
    #3
    Did that but no result....
    Do someone know what can be the problem?
     
  4. Taz Mangus macrumors 68040

    Taz Mangus

    Joined:
    Mar 10, 2011
    #4
    Try doing a SMC and PRAM reset. Another thing to try is boot into safe mode.
     

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