Unable to adjust volume, no sound output

I downloaded the recent updates a day or two ago and haven't used my computer much since. I now find that I cannot adjust the sound (using the menu bar icon, the system prefs, or the keyboard function keys). When I press the key to adjust sound, I see the normal display (speaker with waves) with a slashed circle at the bottom.
In the Sound pane in system prefs, on the output tab, the only device I see Digital Out. Shouldn't I see "internal speakers" or something?
TIA

The headphone jack might be bad. It should switch to the internal speakers with nothing plugged in. It may be switching to optical (which has no volume control) instead. Can you see the light from the LED in the headphone jack? Try plugging, and unplugging the headphones a few times, to get the internal speakers to work? Did they ever work? If not, is it under warrantee (less than one year old, or three years if you bought AppleCare).

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