hp dv7 - no stereo sound?

audi owner

New member
I have an HP Pavilion DV7. The sound is mono - I cannot find any settings to change it to stereo.
It is mono with no extra speakers plugged in. It is also mono when I plug in extra speakers to the headphone jacks. How can I change it to stereo ? when I use the 'test' button, the same sound comes from both speakers, even though only one speaker in the picture shows active.
 
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