I bought my acer laptop 6 months back I tried to post my question to the acer contact service but they just responded with irrelevant links.
About 10 days ago I switched off my laptop as usual when I turned it on again the sound icon had x in it and it wrote no audio device installed, when I went to device manager, I clicked on sound video and game controllers and only high definition audio device was visible. I chose update and chose from my laptop browser, nothing happened still, so I clicked to the sound icon next to clock again and only wrote no headphones or speakers plugged in, what I did is to uninstall realtek from programs turned off the laptop when I turned it on again sound was there. As I thought everything was fixed I switched off at night in the morning sound gone again(no headphones or speakers plugged in). I wnt to the acer website downloaded all the drivers including realtek(windows 10 drivers as my laptop is windows 10) I installed them. Switched of my laptop and on the sound was the everything worked perfectly. Turned it off again when turning it on sound gone under sound, videos and game controllers only high definition audio appeared.
I'm really out of options your help will be appreciated