Does anyone else here use a Turtle Beach headset? I'm curious because I bought one recently and didn't have any problems using it in the beginning. However, after I bought the headset, I bought a flat screen TV that's HDMI-capable. Given that, we decided to plug the Xbox 360 into one of the HDMI ports. Ever since then, I have been unable to use my TB headset without unplugging the HDMI cable and re-routing the Xbox 360 using normal AV cables. Can someone help me with this? Have any of you had a similar problem?