The most common problem in this case is due to the sound driver then check this together:
- Let\'s go to Settings - Control Panel - Device Manager (Device Manager)
- Probably the list that appears at the top you have a page with the yellow triangle icon. Well this means that there is some component of the computer that is not installed correctly.
- Click the right mouse button and select \"update driver\" in successive choices rival even the flag of the research on the internet
- If the audio driver automatically searches have not solved the problem then you can install \"AC 97 audio driver\" that very likely will resolve. Once downloaded the file from the following link you can install it and restart the computer audio will return to work as before.