Looks like ESD damage to me though that’s just a wild guess. You can check for that by getting a multi-meter, select diode tester function then connect the positive probe to DVI connector and then test Data Link1 and digital clock pins one by one with the negative probe. They should all measure around 500-600mV if there is no damage (see https://commons.wikimedia.org/wiki/File:DVI_pinout.png).
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