I have same problem with my Pavilion DV7-4270. What's weird is sometimes it would work. But now, after some updates, it doesn't work at all. What I used to have to do "sometimes" is go to Device Manager, System, and enable the High Def Audio Controller (I have two listed). But my problem is that it no longer works. Sure wish HP would address this issue as it is all over the internet with many various solutions. I don't know what I am supposed to do.
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