Thanks Saltgrass - not sure how to do this !! On 8.1 any attempt to manage audio devices brings up Realtek screen showing "Properties" as "Realtek High Definition Audio" but no sound on 2nd monitor still. No mention of HDMI in control panel audio screens. Default shown as 24 bits 48000HzSince you are probably using an HDMI cable to connect the TV, you may need to set the sound up to use the HDMI output.