I guess that the sound card is either damaged or malfunctioning, but I don't if this is really possible when speaking about notebooks and such.

We can't of course discard the existence of some sort of switch or button to mute the sound card, or to deactivate it.

I never fixed notebooks, so I can't tell you for sure. My guesses are, of course, just guesses, nothing to take seriously.

Best regards, ADFENO.
Have a nice day.

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