I have cheaked my sound driver in my system and looks alright but couldn't get sound output even in earphone as well.give mwe any suggestion my leptop modal lenovo G50.........

What OS are you running? If Linux, try running Alsamixer to adjust your master and other volume controls. If Windows, then see if your system is using the desired channels. On my work Windows system, I have both external speakers as well as a headset, and I need to enable the appropriate one to get output.

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