Problem with sound disappearing

[Maureen L Thomas]

I am using a Lenovo computer with 8G of memory and 1 TB hard drive, AMD 
Ryzen 3 2200g w/radion vega graphices x4, Graphics Gallium 0.4 llvmpipe, 
it is running 64 bit Debian.  Processor is Intel Core i3-9100T, CPU 
3.10GHz, Realtec 8821CE wireless lan 802.11 ac  PCI-E NIC.

My problem is all of a sudden I have no sound at all.  I have checked 
all my settings and they have not changed at all so I should have had 
sound.  There is none no matter what I have done. I need help please.

Moe