Since the last couple of days I get no sound from my TV-set when I plug in my computer with the HDMI cable. The video is working but the information I get when it comes to the audio-devices is that the AMD is not plugged in. I tried to reinstall the device but it's still not working. I also reset the system one week back (when the device was working), but still no change. Is there a way to diagnose and hopefully repair this problem?