Solution:
1, a small speaker, to put maximum volume, the volume might be turned off.
2, Windows7 audio service can not be started You can open the control panel management tools, open the service list, select windows audio service, right-click properties, select the login tab, modify the login option for the local system account, and then apply. Then modify the login option to the specified account, browse to select the local service account, and then confirm that the application will be restored after the restart.
3. If your system is Windows 7 Ultimate, you have this problem. Follow the steps below: Right click on the desktop computer - Administration - Services and Programs - Services - find windows audio service - right click - restart windows audio service, solve it!
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