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Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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Why is my iMac 27" display showing black and flickering?

iMac screen would turn black and start to flicker and I can not see or do anything on it.

If I use Thunderbolt to HDMI cable it shows everything on my hd TV, but the iMac screen itself is just black.

Also for example: If I'm playing music and it blacks out, the music continues to play, just can't see anything.

On an external display I can work on it, don't know if it's some kind of GPU issue or the screen itself.

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Are the last four figures of your serial number any one of the following:

DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8

DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610

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These numbers are on a recall list and Apple will pay for the repair of their faulty GPU.

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Since external monitors work ok it's not the GUP/VGC the problem is with the controller, cables or actual display. I would contact Apple Support about this... there's mild chatter on the internet so this may be "know issue" and have a silent or extended warranty fix offered.

If this Answer is helpful please remember to return and mark it Accepted.

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Can you tell me the end result what was the exact problem and how u fixed that?

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