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iMac 2014 27inch. No display or output. All 4 diagnostic leds are lit green

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    iMac 2014 27inch. No display or output. All 4 diagnostic leds are lit green

    Hi. I'm trying to figure out what the issue is with my imac 2014 27 retina. When I turn on the screen goes light black and no chime. There is no output from the back port to hdmi.

    I thought at first it might be a gpu issue. But all four diagnostic leds are lit up inside. Was sure if there was an issue with the gpu one of them would be off.

    Any help please?

    #2
    Re: iMac 2014 27inch. No display or output. All 4 diagnostic leds are lit green

    1) post a picture of your screen after the power up

    2) try a PRAM reset

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      #3
      Re: iMac 2014 27inch. No display or output. All 4 diagnostic leds are lit green

      I rebelled one who had the same symptom.
      I ask the customer if the four LEDs were on or not and I give you the info, if I have it, asap.
      In my opinion a reballing will be necessary.
      My client replied that he had all four LEDs on despite the GPU being rebellious.
      Do you need the temperature curves to rebound?

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