Can't unmute my computer?

I have a lenovo laptop and it has Windows 8. When I open it it works fine, but after I close it and then, again, open it, the laptop mutes and I can't unmute it! I press the button to unmute it but it does nothing. I checked for viruses (Antivirus: Avast!) but it shows me that I don't have any. I treid to find support on the Microsoft site but again, I didn't find a solution. What can I do?

Reinstall the sound drivers of your pc or try to speak to the micro soft service center

You should check your sound system on the computer. If it shows your speaker are mute then your problem is probably that you have to press Alt or shift or one of those but runs to access your secondary mute/un mute key. You can look up how to access your sound settings if you don't know.

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