1. First, make sure there is no problem with the hardware. You have already said that there is nothing wrong with the speakers and the sound card. Make sure all the connections are correct. Then power on the speaker and turn on the volume switch. If you have tested it on other machines and it is indeed intact, then you can continue reading.

2. Install the sound card driver correctly. If it is an onboard sound card, it is best to install the driver provided on the motherboard driver disk. If the sound driver is not installed, a yellow "?" will appear in the device management or a yellow "!" will appear in the sound, video and game controller, sound audio controller. If you are prompted when installing the HD Audio sound card driver : "The HD Audio bus driver is required but not found." This problem can be solved by installing the UAA patch (click to enter the download page). In fact, when the computer makes no sound, it is often because the sound card driver is incorrect. Generally, after the sound card driver is installed, there will be a small speaker icon in the taskbar in the lower right corner).

3. If you are sure that the driver is installed correctly, then take a look at the volume settings in the computer. If you are using IE, open Tools-Internet Options-Advanced and check if you have all turned on. If it is the Aoyou browser, there is a sound icon on the status bar in the lower right corner of the browser. Check whether it is muted. Of course, the settings of other browsers are similar to the above, so you need to check them carefully.

4. The specific method is: double-click the small speaker icon in the taskbar, and check whether the volume is turned off in the "Volume Control" and "Waveform" items in the pop-up "Volume Control" dialog box. to minimum, or set to mute. If these two options are not available in the dialog box, please click the "Options" menu - select "Properties" - select "Volume Control" and "Waveform" in "Show the following volume controls", and then make the correct settings.