The solution for ASUS S400CA series audio no sound is as follows:
1. The built-in speaker is normal, but there is no sound from external headphones or speakers
If the headphones or external speakers work normally on other devices, please contact ASUS service center for testing.
If the headphone or external speaker does not work properly on other devices, please contact the manufacturer of the headphone or speaker device.
2. There is no sound from the built-in speaker
Whether the mute setting is set, please turn off the system mute. If the problem is not solved, please check whether you are using headphones or external speakers. There is sound.
If there is sound, please contact ASUS service center for testing.
There is no sound. Reinstall the sound card driver and try to check if there is sound. If there is no sound, please back up the data, reinstall the system and try to have sound. If there is no sound again, please contact ASUS Service Center for testing.