This will eliminate any 3rd party driver or program that might be interfering with the Motherboard in recognizing and install Audio drivers. Here is how to do it: How to perform a clean boot in Windows Enter into a Clean Windows Desktop which will disable all 3rd party apps and Startup programs and see if the any Audio drivers shows up in Device Manager. So for the time being the only audio driver it seems to recognize is your Corsair Headphones. That means you have no Audio from your GPU Card since it won't install any AMD HD Audio driver and you have no Audio output from your motherboard since it won't install any of its Motherboard's HD audio driver. If you installed the Motherboard's Realtek driver and it still doesn't show up and your ran SFC and it didn't show any error or corruption in your Windows OS than that does seem to indicate a Motherboard issue. It isn't recognizing any Audio to be able to install a driver. Sounds like your Motherboard is defective. Okay I highly suggest you open a Asus Support 'CHAT' or email.
