Just bought a new monitor and trying to hook up both. I run with a radeo 7950 with 1 hdmi and 1 dvi port and also a motherboard with a hdmi and vga on. Ive tried every combo with no luck. Any help
More than likely the motherboard got disabled. See if you can reenable it.
I would just hook up both to the 7950, it may need an adapter for the cable on the second monitor but it will be worth it.