Nvidia GTS 250 via HDMI no sound

[Rippor]

Hey as the title states i have a GTS 250 and want to run sound through the HDMI output to my Tv, Problem i'm facing is that in Navida control panel states " Your graphics card and Display are HDCP capable" but i have no option in playback even if i right click and select show hidden/disconnected devices.

Mobo - Abit SG-95
CPU - Core 2 duo
GPU - Nvidia GTS 250
OS - Win 7 (32)

I've read that i need to connect a SPDIF cable from gpu to mobo, which i have the cable but unsure of how to connect it and even if i did i would then need to try find how to enable the option to select hdmi output to be my default playback device.

Have latest drivers for graphics card and onboard sound (Realtek)

Any help or suggestions would be greatly appreciated.

Thanks

 

[Rippor]

Is it part of Nvidia gts 250 driver package or a independent thing as i have the latest driver for my card :/
Reinstalled driver but no change?

 

[Rippor]

Ok now downloading to try that but does it matter about the spdif cable being plugged in or ?

I don't see Audio driver ?

 

[Rippor]

I would of thought it would have, nothing i can check to see under control panel>Device manager, what about connecting the cable part, how do i connect the cable to the graphics card?