Tbh, I am a big noob when it comes to hardware I installed the drivers with the disc that the card came with and I have been hearing about how the sound is trying to get the audio from the HDMI and i have to set it back to default but i have no idea how.
ok well first thing I would try is to go to:
control panel\sound\playback and then make your default not your 7850 if it is.
Another great idea would be to open the driver then go to information the in the drop down box software update and check for updates. I think that the original version of the driver had issues like this.
If that doesn't work see if you can use a dvi connector from the card to your monitor