Win7 front audio jack no sound solution

I was in the control panel, the sound settings were all over, and there was still no sound. The only hope is "Realtek high-definition audio manager", but I have ordered all the settings, or not.
So, when I complained about the garbage system, my classmates reminded me to “check the front panel jack detection” and hook it. I tried to do this, but the headphones have a sound!
At the time it was under XP.
Now win7 also encountered the same problem. My system is the original installation version, the integrated sound card driver does not have "Realtek high-definition audio manager", so today I thought of updating the sound card driver. Haha, sure enough, after installing the driver, use the “Realtek High Definition Audio Manager”, the same method will release the sound of the front audio jack! o(∩_∩)o Haha~!