You have installed teamspeak, and in settings push to talk?
E.g. Scroll Lock
When you press scroll lock, it should do.
1. No one is responding, not everyone responds, lots of Pc's are standing 24 a day on, connected to teamspeak, and not everyone sets his status to away.
2. Your microphone c.q. Soundcart is not working correctly.
3. You have pluged the wrong plug in the wrong bus.
4. In your task, you see a sound icon, click on that >> options >> select microphone >> and looke if mute is enabled, if it is, disable it!
Boeing