Win 7 System Computer headphones or speakers no sound solution

To facilitate the operation of the demonstration, we assume that the computer's hardware is working properly, but the headphones are not plugged in to see how the system will give us a hint.

2. Open the start menu, Control Panel , in the system and Security , select Find and solve problems ;
   Put this picture away. expand this picture
4. Turn on the hardware and sound , under the sound option, choose to play the audio , in the Play Audio dialog box, click Next ;
   Put this picture away. expand this picture
6. In the Failure dialog box, select headphonesand click Next ; At this point, it gives the diagnostic information: the peripheral is not plugged in, and the recommended fix: plug in the speakers or headphones .
   Put this picture away. expand this picture
8. At this point, if you insert headphones or speakers, and click the next button, the system will automatically change the repair, and to the following dialog box:
   Put this picture away. expand this picture
   (You can click to view the details to get the specific system diagnostics content.) ）
10. and if you do not plug in headphones or speakers, click button, the system information will become the following:
    > put this picture away