Hi, my DV7-4048cl has no sound either. I tried the had reset method and now when I boot it inmediatly starts making an awful buzzing sound that keeps getting worse and worse as the boot continues. I also noticed that on the Beats audio menu when pluggin in a headset it used to show up with colors when something was hooked up to the computer, now it doesn't. When my media player is playing music I can see the eq part of it moving, though I can´t see it moving on the eq of the Beats.
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