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A1418 / EMC 3069 / 2017 / Processeur quadricoeur i5 à 3,0 GHz, quadricoeur i5 à 3,4 GHz ou quadricoeur i7 de 3,6GHz. Sorti le 8 Juin 2017.

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LED #1 and #2 are on, others are off.

Hi everyone, I just open up my iMac after I have issues this morning. I noticed that LED #1, LED #2 are on, then LED #3, #4 , #5 are off. The fan starts and blow cold air and after it becomes hotter. Naturally, screen is dark and no sound becomes.

Just someday before I upgrade my Fusion Drive set with 250 GB of blade SSD and 500 GB of SSD standard, then I max out my 8 GB 2400Mhz DDR4 Memory with 32 GB 2400Mhz DDR4 by Crucial.

What is the meaning of the LED #3 off?

LP

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Ok, I find a solution. I noticed that after I release the motherboard the GPU screws were too out so i tried to put them in the Max of the strength. Now the system goes on without problem.

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The logic board is not communicating with the GPU. Hook up an external monitor to test.

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Hi, I tried to tighten the screws of the heat sink over the GPU. Over the external monitor, doesn't appear nothing.

par

You do know that an "external monitor" is a monitor that is separate from the iMac.

par

Yeah, I know what is an external monitor.

But nothing is showing up.

par

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Leonardo Pera sera éternellement reconnaissant.
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