problem with hd sound

HI,

I using pvilion 5 1250 ej, NVIDIA 9600m

i have win 8 x64.

When I'm connecting the computer with HD cable to the TV. I get a picture without sound.
The Device Manager registers the following error:

Driver Management has concluded the process to add Service HdAudAddService for Device Instance ID HDAUDIO\FUNC_01&VEN_10DE&DEV_0006&SUBSYS_10DE0101&REV_1000\4&23E1C9DB&0&0201 with the following status: 0.

How can I fix it?

tnx

Avi