Win7 64-bit computer has no sound, reloading the sound card, no use, how to do

My computer is Win7 64-bit, the original has always had a sound, plus the memory stick, there is no sound. It is indeed enabled to "disable the signature jack detection", and also reloaded the sound card driver many times with the driver life. The latest version.
Later, I opened the driver management and found that there are actually 2 sound cards inside. As shown in the figure: an HDMI sound card, a sound card. I thought it was this problem at first, but I didn’t know it later.

The gongs and drums took nearly an hour and went crazy. Finally, finally, share the solution (backup):

1) Connect the computer audio to the middle of the second row behind the jack. I used to pick up the last hole, because there is a pattern of headphones on it

2) in the sound controller, select "speaker" instead of "realtek digital output", many people will mistake I think that you have to choose realtek digital output
3) There is sound, but when the sound does not play music, there will be a magnetic sound. My stereo is a USB stereo. I changed the USB interface and inserted it into it.
by default7#zbphp.com. If your computer has no sound, you may want to try this method.