Hello spedlifeshow,
The issue here can be one of several issues, the following may apply:
- The HDMI graphics card may support HDMI Video, but may not support HDMI Audio
- You may need to set the HDMI audio device as the default sound device
- You may need to update your HDMI video card drivers for your version of Windows
- If your HDMI video card does not support audio, you may need to connect additional audio cables between the PC and TV
For the steps for some of these issues see the following No sound tutorial (look on the Check your Hardware tab under HDMI cables).
http://windows.microsoft.com/en-us/windows/help/no-sound-in-windows
Hope this helps
LD.