Win7 front panel headphones have no sound how to do

The method is as follows:
There are two reasons why the rear audio interface can output sound correctly, and the front audio interface has no sound output: The first reason is the audio of the front audio interface. The cable is not properly connected to the motherboard, or is not connected. Of course, the front panel audio cable is not faulty. At this time, you can only use the rear audio port or replace the front panel of the chassis. The second reason is that the audio driver control panel is set incorrectly. Then you can solve the following methods:
After installing the driver normally, enter the control panel to open “Realtek high-definition audio configuration” or “Realtek high-definition” Audio Manager, or double-click the Realtek HD Sound Manager in the lower right corner of the screen, click on <; Connector Settings>, and disable the front panel jack detection by clicking the hook to disable the front panel audio output or microphone. The input is not working properly. As shown below:
There are also some of the following: Press the arrow on the edit picture and the click order number next to it!
When some motherboards use the HD sound card chip, improper setting will not detect the front AUDIO, which will prevent the front AUDIO from being used. When the hook is hit, no matter whether the audio output device is connected to the front, the computer has an output in front of the default, and the front audio output or the microphone input cannot be used.
confirm the default device state:

3, different rules of various methods of cable motherboard, the motherboard detailed view of the description above has described