I have tested both the DVI ports, the HDMI port and the Display Port. I technically had two displays plugged in at the same time as I was playing in VR at the time it failed. I do have a IGPU but it is the one in the I7 4770 so not exactly top of the line. I will probably mothball my system until I get a replacement card as I can use my laptop in the meantime. Thanks for your suggestions and concern.