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iMac Intel 27インチ EMC 2309 (Late 2009, Core 2 Duo 3.06もしくは3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHzもしくは Core i7 2.8 GHz) ID iMac11,1

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Can I use my iMac (late 2009) with faulty GPU as an external monitor?

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My iMac is showing vertical bars upon startup. It is a Graphics Card problem which is expensive to solve for a 10 year old machine, so I have decided to purchase a new PC instead and was wondering if I can use the iMac as an external monitor using Target Display mode. My question is, Does Target Display mode need a fully functioning GPU on the iMac, since it is essentially being used as a display using input from another PC?

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Have you given Target Display Mode a try?

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Not yet... The imac is out of action and I don't have another PC to try it out yet.

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Are you sure your GPU is gone? What happens when you plug in an external monitor? If the external does not show them then you’ve proven the issue is within the internal display.

Post a few pictures from your iPhone so we can see the issue iFixitでの質問に画像を追加する方法

Update (10/09/2019)

Ouch! Your GPU’s Video RAM is bad. It could be just a bad solder joint on one of the chips. Using some flux and a good iron or better yet a hot air rework station you might be able to get it working again.

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Chris Anastasi さん、ありがとうございました!
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