First, you need to take out all your components with the exception of the cpu, ram, and video card. Make sure both the ram and v-card are seated correctly, even try reseating them, as well as the cpu. If nothing changes, try swapping the video card, then the ram, and if possible the cpu. If all else fails, take everything out of the case and rebuild it on a static bag to make sure the mobo is making contact with something inside the case. If that doesn't work, then you need to swap parts in order to find out what's causing the problem, good luck