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Could be an audio driver issue. Does the sound work okay if you plug in external speakers or headphones? If problem persists with headphones/external speaker
Boot into safe mode (F8 on windows restart)
Select Safe Mode
When windows loads (it will take longer than usual).
Control Panel > System Properties> Device Manager > Delete/ Uninstall your audio drivers, reboot your machine - audio should work now.
Most likely its a nardware problem. If Device manager shows the audio driver is working and enabled and when you plug an headphone into the headphone/audio out and you only get sound from the right headphone then the audio amp chip is faulty. If the headphone sounds OK then the easiest solution is to connect a set of powered speakers to your laptop.
you need to uninstall and reinstall the audio driver or try to uninstall adn reinstall the player that you are using to hear sounds? is it doing the same if you are going to use a headphone? if so thats only a software problem, if headphone sounds fine, its the internal speakers thats having problem.
if using XP, go to start control panel , sound and audio devices.Under the audio tab make sure the C Media CM106 sound device is selected under sound playback. Then under the volume tab set the volume somewhere in the middle or at the top if you don;t have active speakers . Then Under Speaker settings advanced, make sure the speaker setup is set to Laptop Stereo speakers. Also make sure the speaker volumes are up on the speaker volume button. click ok. If no result check that the cm106 sound decvice was cemented in as I saw it dissaper when I thought i had slected it. I think the key thing here is the device and the laptop speakers setting.
Check device manager and make sure the audio drivers are not disabled. If so enabled it. I am quite sure you have checked to see if its muted. If it is enabled and its not working, try updating the drivers or uninstalling and reinstalling latest driver audio driver OEM site.
**If you reinstall the same driver you might get the same error but its what a shot.**
Believe it or not, not all speaker plugs, even if they are of the same size are NOT made the same.Some times the "male" PLUG pushes into the "female" socket in such a way that it makes NO connection or does not make the right connection causing the headphones not to work. TEST: play music that u can hear through the internal laptop speakers, and while the music is playing, plug in the headphones. The internal speakers SHOULD cut out, and under normal conditions the music should pass through the headphones. If the speakers cut out and the headphones don't work, your plug is damaged. If the speakers DON'T cut out after u plug in the headphones, your plug is open. Depending on the audio circuit, your audio amp. inside the laptop is going to get damaged. It depends on the WAY the audio circuit was made.
Before going to any shops, here is a suggestion that can't hurt anything.
Go to the Control Panel and click on Sounds and Audio Devices. On the Volume tab at the bottom, you will see "Speaker Settings". Click on the Advanced button. Change that setting to "Stereo headphones". You should hear the sound only through the headphones then.