I was playing GTA 5 when my computer crashed and various colours flashed. When I rebooted a few times, it kept flashing colours immediately after logging in. Now, when I plug in my displayport to the graphics card, there is no signal, but when connected to my motherboard, there is video out. Is my graphics card dead or is it a driver issue? FYI I have an I7 4790, acer proprietary motherboard and EVGA GA 650w PSU.