Why is my microphone not have sound?

Several possibilities for your reference:
1, wheat is perfectly good (can be used on another machine)
2, do not plug the wrong jack
3, the volume control in the microphone does not mute off
4, the sound card driver has been reloaded N times, the new old have tried
5, the volume control → Properties → Recording → ​​microphone below the hook has been marked
6, the volume can be adjusted, but the flat tone can not be adjusted, because this column is grayed out, this is the crux of the problem. In addition, the advanced properties in microphone bass and gray level can not be adjusted, the pointer points to the lowest level, this is also a problem because of it.
7, the front of the jack (installed so installed capacity of staff had installed, so it is feasible before) and the host behind the jack have tried, the same phenomenon.
I do not know what software is not conflict with, or is the system has a problem, it is a hardware problem, I can not find any reason. Some friends said that they had encountered such a situation, reinstall the system a success, there are still the same after reloading friend said, I really do not want to reinstall the system, hope to have had a similar experience of friends left point of your experience, of course, , If I find answers to your questions, I will send up for our reference.check here to find the usb microphone