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sound card no longer seems to function?

I seem to have the necessary drivers on my computer, but when I try to open sound programs I am informed that there is no hardware installed. When I look in System Information / Components / Sound Device, there is simply nothing there.
It used to work just fine. I recently went out of town for a spell, packed up my thinkpad into its protective case, returned and found it untouched, but suddenly the sound card is no longer recognized. I even tried reformatting the whole machine with no luck. What can I do? Why would it simply stop working like that?
 
sad I’m frustrated
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