Recently upgraded to Windows 7 Build 7100 from Windows Vista. I have a Toshiba U400-108 laptop (PSU40E-009005EN) with HDMI out, however when I connect this to my LCD via an HDMI cable there is picture but no sound. I have tried unistalling the Intel(R) High Definition Audio HDMI and the Conexant HD SmartAudio 221 and reinstalling the drivers (although Windows installed Microsoft's own HD Audio driver and not the Conexant one) but still having no luck with sound through the HDMI cable. Can anyone shed any light on this? Thank you so much in advance!