My Dell Inspiron 15R N5110 came installed with Windows 7 Home Premium (64 bit) and IDT High Definition Audio Codec PC Audio Version 1.0.6324.0 (64 bit). I upgraded to Windows 8 Pro with Media Center and there was no problem with the Speakers/Headphone. A few days back, I upgraded to Windows 8.1 Pro with Media Center and now there is no sound from Speakers/Headphone. Presuming a compatibility problem, I checked for updated driver through Windows troubleshooting. It reported that my Audio driver was the latest. What should I do?