Today my computer crashed as i was playing FiveM (a gta 5 mod). After i turned it back on the displayport i was using stopped working and so did the hdmi port (wasn't using this one at the time, i tested it afterwards and it didn't work either). But the DVI port/ cable still works on my computer screen. I am pretty sure it doesn't have something to do with the cables as the computer shut down and all of a sudden the displayport stopped working. I also tried the HDMI from my Macbook onto my computer screen and that worked fine.