How to fix if the computer loses sound.
1) Launch the product if it is closed, or quit it if it is launched.
2) Switch the sound card manually:
For Vista and Windows 7:
Click the small trumpets under the right corner on the desktop, select Playback device and change the playback device to the default one.
For Windows XP:
Click the Start menu, select Control Panel > Sound and Audio Devices > Audio Option and set Default device as the physical card of the computer.
If the above doesn't help, please contact us with a screenshot of the sound device list under Audio Option or Playback device tab for further assistance.