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iMac Intel 27". EMC 2309 (fin 2009, Core 2 Duo 3.06 ou 3.33 GHz), EMC 2374 (fin 2009, Core i5 2.66 GHz ou Core i7 2.8 GHz)

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2 leds on without GPU, 1 led on with GPU. Why is that?

As soon as I put my GPU in I’m getting only 1 led light on. If I remove the GPU two led lights are on. I tried two different GPU cards and the same things happened. With the external monitor plugged in I’m getting the 3 leds on. So strange. Did anyone experience similar things. Thanks in advance.

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@danj I'm confused about this question but you are the SME so.... :-)

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SME?

I opened the iMac to see what’s wrong and therefore i removed and changed the graphic card. While no screen attached I wanted to run it and see how many leds were on hence the possibly confusing conclusion. I am no expert so maybe my explanation wasn’t the best.

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Subject Matter Expert. @danj has more experience on all macs than me... He should chime in in the next few days to help.

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Lukasz Gudaniec sera éternellement reconnaissant.
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