My Microphone doesn't pick up my voice, It only picks up computer output sounds.

Benetoslav

TS Rookie
I bought a new Headphones, because my old one broke. So I plugged them in and everything looked okay. Then I tried to use my microphone on discord and teamspeak. And then it happened. The mic only pick up output sounds from PC, but didnt pick up my voice or anything. I dont know what to do. Hope you can help me. Thanks for response.