I have a Sapphire Dual 280X and my audio output doesnt work. It used to work when I was using the onbord hdmi connecting, now i cant use the hdmi to output video to a second monitor and audio doesnt work. Yes, i have the latest drivers installed. In the audio options it shows de amd audio driver, but they are disabled and in gray, there is no option to activate it. win 10 64 bits, everything updated and well installed.