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 display Flashing Black -DisplayPort cable

This appears to be a common problem with many iMacs, many variations. It's maddening.

The Apple service manual (Deep Dive) states that the issue I'm having is most likely related to the rather fragile looking Flex cable. I've attached a picture. Anyone else think that cable looks bad. An external display work fine.

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Answer this question I have this problem too

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Well, it's not designed for a gorilla hands ;-}

Yes, you do need to be careful opening the system and putting back together. Over stressing it can damage the connection on either side.

As for your image, not enough is visible to tell you if you damaged it. So the question I have for you is why you opened the system in the first place? Because of this or because you were upgrading the HD or adding in a second drive (SSD)? Give us the background so we can aim you on whats needed.

FYI: I've got gorilla hands! And I've always had a tough time getting the connection out and in as well in the older models.

The newer 'Thin Series' has a slightly longer cable! But you do need to be careful on taking the display off as you can kill it using the wrong tools or techniques.

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Phil will be eternally grateful.
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