terrybull
Juanito is the guru here in case you have not gathered.
I will just add some quick comments.
If you open a terminal and type this command and press enter
lspci -v
If you see no mention of any audio device or devices......then reboot and get into bios to enable sound please.
google suggests you might not have a Yamaha sound device but one which is supplied by Intel. Maybe its a Intel8x0
If you can't get sound after reading both the alsa info and the alsa-config, report back and we will go thru some trouble-shooting steps to
detect your hardware--detect your kernel module--then to setup sound---------------------only if you can't get sound the easy way
good luck