I just installed a GTX 760 into my computer which previously had an AMD card. After I installed the card, my Realtek HD Audio Manager decided to stop working. When I plug audio devices in, it no longer has a window pop up alerting me that I've plugged something in. After opening Realtek HD I saw that nothing plugged in was being detected, except for DIGITAL. Picture below is what I see. In Control Panel -> Hardware and Sound -> Sound, it says nothing is plugged in in both Playback and Recording except Realtek Digital Output. I can't set anything as default because it is greyed out. I've tried restarting, reinstalling the drivers(via Device Manager), a system restore to when it was working, nothing has worked so far. I'm running Windows 7. Wondering what is wrong? Sound was working fine before I installed the card.