Welcome to the New Logitech Community Forums Willx. 
Try testing your microphone on Windows Sound Recorder on your PC:
1. Click Start -> Programs -> Accessories -> Entertainment and choose Sound recorder
2. Click record button and speak to see whether the green line moves to indicate the application picks the sound.
3. Click on Stop button and Play to check the sound. Make sure the device is selected
4. Click Edit Then Audio Properties and select the preferred device for Sound Recording
2. Click record button and speak to see whether the green line moves to indicate the application picks the sound.
3. Click on Stop button and Play to check the sound. Make sure the device is selected
4. Click Edit Then Audio Properties and select the preferred device for Sound Recording
Let me know if it works here.
