Can't get audio from Dell Optiplex 745

Hey , I am trouble shooting a friends old computer its a (Dell Opti Plex 745)

I get no sound , I check the speakers on another computer and they work fine.
Its been like this since May but before then it worked perfectly. Any help would be greatly appreciated. thanks
 
see and skim THIS thread. Are you seeing yellow icons in device manager too? in any case, do the same as in that thread and go to dell website to try installing, in your case, audio drivers for your pc
 
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