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Display first flickered; now massive errors

It started some weeks ago; My screen went randomly black for a verry short time and then turned on again.

Now my screen is flickering and some parts have stripes on it.

Here is a picture and a video:

Can it be that the display cable has a loose contact?

Thanks for your help

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Hook it up to an external monitor to help isolate the problem. If the picture on the external is OK then the GPU is good.

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The picture on the external monitor is OK ... so I suppose its a problem either with the display or the displaycable...

iMac Intel 21.5インチ EMC 2544