How can I fix the sound on my Dell Vostro 1720 laptop?

null November 18, 2010
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I have a relatively new Dell Vostro 1720 laptop. All of a sudden one day the sound would not work for a webinar and still does not work.

I’ve gone into Media Player and looked at the settings, but could find nothing that looked amiss. When I click on the microphone, it says that volume is at 100%. I don’t know what else to do. Can someone help?

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