Please go to run and enter "devmgmt.msc" you will get device manager. In device manager check any unknown device or yellow exclamation is there or not. If any one is there download the driver and install properly. If it is installed please go to run and enter "Control" that time you will get control panel. In that window you can see sound and audio device . Please check it is working or not. If it is installed check the connection and the speaker.
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