The solution to the problem of no sound in the ASUS UX21E series audio is as follows:

1. The built-in speakers are normal, but there is no sound from external headphones or speakers

　(1) The headphones or external speakers work normally on other devices-->Contact ASUS service center for testing.

(2) Headphones or external speakers do not work properly on other devices-->Contact the manufacturer of the headphone or speaker device.

2. There is no sound from the built-in speaker

Whether to set the mute, please turn off the system mute.

　(1) There is sound-->Contact ASUS service center for detection

　(2) No sound-->Reinstall the sound card driver and try to check if there is sound

(3) There is sound --> Sound card driver problem

(4) No sound --> Back up data, reinstall the system and try to have sound

(5) There is sound- ->System problem

　(6) No sound-->Contact ASUS service center for testing