However I'll tell you that I have a 2.5 year old Toshiba L755 laptop running Windows 7, and the speakers always work for 30 seconds to a minute, then crap out completely. If I plug in headphones or external speakers, the sound is fine. I finally got tired of having the wires to the external speakers and went with bluetooth. I had to invest $15 for a bluetooth adapter for my wife's cell phone, so I invested $35 in a bluetooth speaker. It works great and sounds infinitely better than those laptop speakers. I dunno if this will help you or not, but it sure was the ideal solution for me.
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Good luck.