Sound not working on HP Spectre x360 Windows 10

[apullu]

The sound on my HP Spectre x360 Convertible 13 has stopped working. I have tried everything. I restarted and force restarted the computer. I have uninstalled and reinstalled the audio drivers three times. I have system rebooted to factory settings. Nothing is working. What is going on? 

[banhien]

@apullu 

Please do a clean install Audio software/driver, this should help.

  (a) Download the following driver and save on your computer,

                  https://ftp.hp.com/pub/softpaq/sp98501-99000/sp98713.exe

  (b) Go to Device Manager, Sound to uninstall sound driver (Realtek) and reboot,
  (c) Right click downloaded file and select Run as administrator,
  (d) Reboot again.

Regards.

[apullu]

This did not help. I followed your instructions exactly, and did the process three times. The sound is still not working. This computer is only three years old. I do not use it for any games, movies, or streaming. I use it work and video calls at work. I use no other programs. The sound worked perfectly yesterday, and today nothing. What is going on?