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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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iMac 27 "A1312 mid 2011 doesn't recognize a working GPU

Dear friends,

my iMac 27 "A1312 2011 has just stopped working and isn't showing any image. I turn it on, It chimes but the 3rd LED indicating the video is communicating with the logic board doesn't turn on. Initially, I thought it could be the video card but I tested it on my friend's iMac, and it was working flawlessly. Everything seems to be working fine, but the video doesn’t appear. I tried to reset the VRAM and SMC unsuccessfully. The %#*@ LED doesn’t light up. Can anyone give me a tip on how to work this out?

This iMac never let me down.

I'd appreciate any contribution that can be made.

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First hook up an external monitor to verify that the GPU is working in your machine.

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Dear friend, thanks for your comment.

Well, I hooked up an external monitor and I got the same thing, no image on the external monitor and 1st and, 2nd LED on.

por

It chimes but no video.

por

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MOST likely the connection of the GPU to the Motherboard

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This repair guide may help.

https://tim.id.au/laptops/apple/imac/ima...

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Gerson Bernardo será eternamente grato(a).
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