dragonslapp22 :
I just recently installed a new 7850 in my computer. When I did the sound went out. I tried everything to fix it. New drivers, deleting old ones, switching default sound channel. Nothing. But my old card is a 7850 too. (older, and isn't working well which is why I replaced it). I put it back in and my sound starts to work again. I don't know why, any help appreciated.
Could be that by mistake the sound card became a bit loose when you installed the new graphics card ?
Try installing the new graphics card again and ensure the sound card is properly inserted.
Otherwise, try going to device manager and disabling the sound card then enable, try repair, update driver, all options that you can see there try them...
Let me know how things go to be able to further assist you,
*** All suggestions in this post are merely suggestions and you do them at your own attempt and risk.