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Ok cable should be fine this is really strange mate has your wife got a pc could you put the 970 in her pc and try with your monitor
That's the wierd thing, the 970gtx was pulled out of my old system {listed in my sig) except I sold the 5700xt gpu) and used with my Philips monitor using the dp cable no probs. I even had to move the 970 this morning for a few hours to finish some work with my old computer.
Only have one gpu till I can grab a 3000nividia.
Just tried updating to the new bios, that didn't change anything.