I have a Toshiba Satellite C875D-S7225 running Windows 7 (64-Bit) and two HDMI TVs (not SmartTVs). When I connect the HDMI output of the Toshiba to either of the HDMI TVs I get a picture but no sound. I've checked my Toshiba's sound options but cannot see anything relating to TVs. Where can I check further?