The first thing to try is a set of headphones to make sure its not your speakers. Failing that I would try uninstalling and reloading the drivers, you can search for drivers for your laptop here, unfortunatly Lenovo doesnt allow me to directly link to the drivers for your specific model, but if you follow the questions it will give you a list of all the drivers for your model.
http://support.lenovo.com/en_US/hope this was helpful
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