First check whether the sound card is installed normally, open the device manager - sound, video and game controller, there is a yellow exclamation mark on the sound card device! It means that the sound card installation is not normal;
The sound card is abnormal:
Check the computer's sound card hardware model: start - run - input: dxdiag command - OK, you can open the Direct X hardware diagnostic tool, and then select - sound, you can see the sound card model. Then download the corresponding sound card driver.
Or: Click to reinstall the driver---select to install from the list---select the path to download the sound card---the next step is OK to complete the installation. Novice friends recommend downloading the "Driver Wizard" software.
Sound card is normal:
1. Open Control Panel--Hardware and Sound--Realtek High Definition Audio Manager;
2. option, jack settings will open the AC front panel;