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Model A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3 or 3.6 GHz Core i5 Processor

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21.5" mid 2010" iMac, Is there Video Card that can be replaced?

Screen hashed up with grey lines or spots. Apple on screen steady behind the spots

Is this a video card problem and is it separate from the logic board and replaceable?

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First hook it up to an external monitor to confirm that it is the GPU. These can often be reflowed with a hot air work station. I have had about a 70% success rate doing this. There are also repair services offered on eBay. Compare prices on a repair vs replacement and be sure they have a good warranty. Here's how to replace the video card: iMac Intel 21.5" EMC 2389 GPU Card Replacement

@rany may also be doing this service now and shipping would be cheap on just the card.

@refectio may also be doing it.

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