I recently started having the same problem with my laptop. When plugging in my pair of headphones, the sound only comes out of the left side. My laptop is also the same model, an HP Envy 4-1043cl, and I've also test my headphones on other devices and the monoaudio issue seems to only be with the laptop. I checked the tests on the troubleshooting guide that was linked, but it still did not fix the issue.
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