Have you muted the sound in another app and it's running, unknown, in the background?

I am fiddling around with the machine now, but I can't see any apps.

On top of that, I did a full reset etc, so that should have wiped any setting issues, or so I would have thought.

I have an iPhone and could not get the sound to work. No phone ring, no text alert, nada... spent days until I remembered a little button on the side of the phone you manually toggle to turn sounds on and off. I had accidentally toggled sounds off while cleaning my phone.

Thanks to you and all others for your sage advice, but I think my Chromebook needs to be fixed. Hopefully, Samsung agrees this is a warranty repair!

I finally sent it in to Samsung's authorized repair center in NJ. They said it was liquid damage and the the warranty was consequently void. I wound up scrapping the unit and getting a nice refurbished Chromebook.

I think the water damage fried the sound chips.