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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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Video card is good but only 2 led on

Hello guys,

I have an iMac 2011 A1312 which video card is failed and I replaced with Radeon WX4150 ready to use from seller. it runs fine at first, but when I install mac os it always dead on half progress. then I tried to use the video card on my 21 inch core i3 imac and it's fine. installed big sur with no problem. but when I use it on my A1312 imac, only 2 led on. fan running but like no activity. I clean video card slot but no luck. am I damage something on the board?

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The GPU board you got is not recognized by the systems firmware so the OS installer won’t work, even if you swapped the drive around to your other system to prep it I don’t think you’ll get the full resolution the MXM board could offer.

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