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Lenovo, Windows 7. It works again after restart ... for now.

It sometimes happens after I use the headphones, so I tried to force disable them from registry ("ForceDisableJD"), as described in another post.

However, It happened again without headphones involved. What can I do more?

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    Having the mixer controlling sounds by device and ... by application is an terrifying awful idea :O, I need the simplicity of my ... former laptop
    – Liviu
    Dec 27, 2013 at 14:07
  • Clean and test the 3.5mm headphone jack for damage, gunk, loose connections, etc. (you'll need to take the notebook apart and have a continuity tester handy). Dec 27, 2013 at 14:09
  • Is this an internal or an external intervention? I hope you don't really suggest to use a turnscrew: not good at that and I am abroad, cannot risk it.
    – Liviu
    Dec 27, 2013 at 14:21
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    I do suggest that, because this is SuperUser not AfraidToFixMyOwnComputerUser. ;) If you're uncomfortable with taking the notebook apart, then I suggest packing it up and taking it to an authorize repair depot. If you want to narrow it down to hardware vs. software, backup your data and reinstall Windows fresh (or install it fresh on another drive, or try a LiveCD); if it keeps happening, it's more than likely a hardware issue. Dec 27, 2013 at 14:56
  • Do you try to plug in the headphones again when this happens? Check if the sound comes from headphones when this happens.
    – Hunter
    Dec 27, 2013 at 15:17

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So the answer was to have the producer's drivers (and their additional software - like a dozen of new applications doing almost nothing). After I installed those, everything worked alright. So before internal & external cleaning, first try the soft(ware) solutions (a Linux test would have followed, and only afterwards., as the final solution, the cleaning).

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