Laptop dv7-3162nr has lost all sound. Control panel reads there is no sound device, Help!

Laptop dv7-3162nr has lost all sound. control panel reads there is NO sound device. Help!

Hi,
DV7 is a series of dozens if not hundreds of models, what is yours ? Please bear in mind normally HDMI sound on computers go from video cards, not "sound" cards.
Regards,
BH
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