So I was playing Civilizations V when out of nowhere the sound cut from my headphones to my monitor's speakers. So I head over to hardware and sound from the control panel to test the headphones but unfortun ately, when I press test the green bar doesn't even fill up. A lot of times it fills up but you don't hear anything or the headphones aren't shown to be connected at all, but this wasn't the case. Since my headset is a two-part system (headset with audio jack and soundcard with usb cable), I unplugged the audio jack from the sound card and tested it with my iPad. It played sound normally. Also, I know the soundcard and usb cable are plugged in to the computer because the LED lights up properly, just no sound. Any ideas?