When did the issue start? Please update the BIOS as well.
Try earphones and front jack and let us know if your get audio.
Did the audio work ever ?? If yes, try doing a system restore.
If none of the above works, we suspect motherboard faulty.
The audio problem started when I updated the bios to A10. I tried earphones with the front jack, still no audio. The bottom right corner has the red x on the speaker icon. When double clicking it, windows can not find a solution to the problem.