My windows 7 machine was running perfectly the other night. I was watching a movie with my headphones. The problem started the following day. Now if I try to listen to anything on the computer, I must have my headset plugged in or I get no sound. Everything show's its' working correctly in device manager and I even tried going back to the last known restore point. Still no go. I'm scratching my head here folks. Hopefully, you guys won't have to scratch your heads nearly as hard.