When connecting to any online sites like Facebook , sound is not coming but picture is clear in Videos. The following prompt appears when testing sound while online: This device is using another application. Please close any other devises that are playing audio to this application and try again". But there aren't any other devices in this PC, using the sound. Installed IDT High Definition Audio CODEC recently. There aren't any chat programs like Skype that I use which starts automatically when turn on the machine.
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