How to solve the win7 system after reloading no sound

1. First click the Start menu to enter the Control Panel, then select the Sound option. In the open sound interface, double-click the “Speaker” button to open the Properties window and switch to the “Level” tab to keep the speaker. The button is in the normal state, as shown below.

2. If there is no sound in the microphone, then switch to the “Level” column in the “Record” tab, and also make sure the microphone sound is on;

3, then check if the sound service is disabled, right click on the "Computer" icon to select management, then in the service options, find "Windows Audio" on the right side of the window, double click it, and then make sure it remains Startup status.

4, check if there is a problem with the sound card driver, right click on the computer icon to select properties, enter the device manager, and then check whether the sound, video and game controllers have yellow or red exclamation marks. Item, if any, try updating the sound card driver (downloadable driver wizard for automatic updates).