Black vertical bands on iMac
After disassembling my iMac 21.5" Late 2012 (EMC 2544, model A1418) to install an SSD two vertical black bands have appeared on the monitor, which start to appear gray and after a few minutes turn black, on my secondary monitor the image it works perfectly and the iMac itself works without problems.
What could be the problem? I have checked and checked the two monitor cables several times, but I do not see any damage.
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