My audio doesn't work. It worked fine when I built the system about 4 years ago, but it hasn't been working for about a year now (major bummer). I have an Asrock Z77 Extreme4. I did all my trouble shooting quite a while ago so it's not fresh in my mind. Speakers don't work plugged into the rear jacks and headphones don't work plugged into the front jack either. Everything I look at, whether it's the Windows troubleshooting tool or the Control Panel or HWiNFO, shows devices working properly with green checkmarks. I made sure I had the latest drivers (although it didn't make sense to me that it was a driver problem since it worked fine for years until it just stopped working). Then I decided that maybe it was a motherboard failure so I bought and installed a Xonar sound card and it still doesn't work! The front audio jacks are plugged into the sound card now but headphones still don't work plugged into the front jack, and speakers don't work plugged into the rear sound card jacks. What's going on? Could the sound card not be installed properly or it's not my default? Help please.