Sound only comming from subwoofer

the sound on my dv7 is only comming from the subwoofer and the mute button by the volume control is stuck on red but the volume its self is not muted

Try Uninstalling/Reinstalling the Driver for the Audio in the device manager.
Click Start - Right Click Computer, Click Properties.
Click Device Manager on the left.
Scroll Down to Sound, Video and Game Controlers. Click the plus-sign beside that.
Right click on the two drivers you should see there, then click uninstall. (You'll have to do each of them individually.)
Click "OK". (Do not check the check box.)
When they're both gone, restart the NB.
They should automatically re-install on re-start.
Re-start the machine a second time, try the sound again.

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