Suddenly sound gone with the laptop?

I have no more sound. No headphones connected.
there's something about loudspeakers.

but as I said I didn't connect anything

Is the loudspeaker symbol missing at the bottom right next to the keyboard symbol?

Maybe muted, e.g. With "Fn + Fxx (xx stands for 1-12).
which laptop?
After looking, right MT on Start - Settings - System - Sound, whether there's something.