is ASUS P8H67-I and radeon hd 7870 compatible? my old card is cyclone r6850, i am upgrading amd to amd. after i plug everything in, there is no respond from my monitors, it is just black. the radeon hd 7870 fan is powered on. i checked the monitors' power is on, tried to switch around dvi/hdmi cables, duel to single monitor, and i just couldnt figure out whats the problem.