I have a Laptop that also had sound problems.
The correct driver was loaded and PCM and volume were maxed and still no sound.
Then I expanded the alsamixer window and found one called Speaker that was set to zero.
I cranked it up and then I had sound.
So sometimes, it is using a number of settings to get sound to work.
Also, I have learned that if you have a speaker icon on the taskbar, you have a driver already loaded.
In that case, bypass the alsa wizard and use the mixer.
I have seen cases where rerunning the wizard causes working sound to be lost.