If your computer can not play any sound including no system sound, you can follow the steps below to restore sound to your Windows system.
1. System restoration. If you have Windows XP or Windows Me, use the System Restore feature to return the computer back to a time before the issue began.
2. Remove recently installed hardware or software. If you added hardware or software to your computer immediately before the issue started, remove the added hardware or software. Be sure to turn off the computer before removing hardware. As with any problem that arises with computers, reversing a process that started a problem may correct the problem.
3. Be sure to check the obvious:
*Are the speakers turned on and have power?
*Try unplugging the speaker power adapter and keep it disconnected for 30 seconds or so, then plug it back in.
*Try plugging a known working item (such as a lamp) to check the wall outlet for power.
4. Sound settings. Check to insure that the Mixer Control volumes are set to 3/4 volume and are not muted. Analog or digital can be set in the Mixer Controls, depending on the type of sound card and speakers used.
5. Make sure that all connections to all speakers are fully seated. Usually, these plugs click twice before the fully seat.
6 Try plugging in a known working set of head phones to ensure that the sound card is functioning.
7 Try plugging in the speakers to a known working portable CD player that will accept the same connection. This will determine if the speakers are working.
8 Go to: Start>> Control Panel>> Administrative Tools>> Component Services>> Services. Make sure audio is enabled.
9 Go to: Start>> Control Panel>> Administrative Tools>> Services>> Windows Audio. Make sure “Windows Media” service is running. If it’s not, right click on this service and select “Start”.
10 Go to: Start>> Control Panel>> Sounds and Audio Device Properties. Be sure that the “Mute” checkbox is unchecked.