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

[gersrt]

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?

[mon2]

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

[pascable]

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?