I was playing WoW one day and the sound cut. I checked my sound card's USB and speaker connections, and all were connections were secure. So i go to the volume control and make sure i didn't accidently mute anything with my keyboard. All were unmuted, so I went to the Device manager. The sound card wasn't there, and Ventrilo never picked up the card either. I restarted the computer, and it worked from then on, but what im stumped at is why it just disappeared like that. Can you guys possibly help me answer my question?