When I was over there earlier, and we'd restart the pc with the monitors plugged into the 7850, nothing would happen. No video. Zilch. 7850's fans were spinning, it was fully inserted, same with its power cable, a 6 pin, and we tried a 6+2 pin at one point, but it wouldn't output video. So we'd go back to the MoBo, and the APU would give us video.
We installed CCC too, a default version, and then one hand-picked off AMD's site for the 7850, in-case it needed the CCC to be installed already for drivers or something; No dice.