Koss Radio Communications - Recent Questions, Troubleshooting & Support

change its internal speaker after check its connecting wire

Describe your setup and I believe it can be resolved.

Is your headset plugged into the jack on your headset for speakers? If so, they won't play as long as the headset is plugged into them. Once you unplug them, they will play again. It's an either/or situation, as they assume nobody wants headphones and speakers to play at the same time. If that's NOT the case, please supply more information.

goto your device manager and remove the headset , your speakers should work again

Sounds like the jack on the front of your device is not working properly. Do other headsets work in that jack or no?

Windows isn't directing sound to the headset plug. This can be changed under control panel sound.
Sometimes it will asign itself if you turn on the computer with the headset already plugged in.
Also check the settings under all programs --- accessories -- entertainment -- volume control
and make sure the volume isnt too low or muted for the device.