The solution to the problem of no sound from the ASUS S400CA series speakers is as follows:
1. Please check if An external audio device is connected.
2. Please check whether the volume setting is mute.
3. Please check whether the external audio device is damaged.
4. It is recommended to upgrade the BIOS and drivers.
5. If it cannot be used, it is recommended to contact the service center and ask an engineer to conduct a detailed inspection.
Related reading:
What to do if the computer has no sound
How to set up the microphone to have no sound