I have a amd radeon r9 270 running matching 24in monitors. Occasionally the monitor running off the display port becomes unrecognizable. It still works but stuck in 640x480 res. I'm not a computer guy, but anythought on what to do? I have changed cable and updated drivers but same thing. Trying drivers again as we speak, but anyone have any thoughts? I have fixed it in the past, but cant remeber what combination it took to work.. Dont make me look too stupid. I work on airplanes, not computers.