I have been using Realtek audio for a while, and it has been working fine. Just a few days ago, I couldn't hear anything through my headphones, so I went onto device manager, and "Realtek High Definition Audio" wasn't in "Audio inputs and outputs," and "Sound, video and game controllers." I didn't touch anything in my motherboard either. If there is any way I can download a driver or something else, let me know. Thanks!