I had this issue with my old Dell computer, and it could be this – the headphone port failed. If it is that, depending on how it failed, you may be able to put a headphone jack in and pull back to get some sound to your headphones (i.e. if you put a jack into the port and push it up down/side to side you may get some sound- over time this is bad for the jack itself). I couldn’t replace the port as it was satured (spelling?) to the case of the laptop underneath a side you could not access no matter how well you took it apart unless you wanted to break the “weld”.
When this happen to me, because the jack then confused the on board soundcard of where sound should be coming from – my on board speakers failed as well. Despite what you may think, in my case you could not tell the on board sound card to use the on board speakers via software (I googled and googled).
The fix – a USB sound card, worked like a charm. May want to confirm the problem is the port failing prior to spending the $60-$90.
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