If everything is ok with your hookups, you can try to download Realteck audio. It's free and you will have sound. Sometimes the windows operating sytem loosing the sound. Or the Sound card is going out. If you have a sound card that is removeable, you can take it out and put it back in. Could be some dust or something that obstrucks it from performing good. The microphone jack is (pink) and located with headphone jack and web cam jack on the back of your computer, or if you have them in front, just plug you mic in there. Unless you have a laptop, your pc won't have a built in mic. Most Laptops to.

The pitch has to be within the 6ft-12ft range.