No sound coming from my tv speakers only from pc speakers please HELP

I have a media center pc and I hooked it up to me tv the sound wont come out of the tv speakers I can only use my computer speakers how can I get sound from my tv speakers because I downloaded movies on my pc and trying to watch them on my tv.

 

Set the dafauly audio device to HDMI...or just dissable the other audio.

 

on what? TV or Pc

 

I just run the one cord from the pc to the tv and theres no sound coming out of the TV only the computer speakers do I have to run something else?

 

I pluged rca cables from the PC to Tv but theres still no sound can someone please help.Thanks

 

On the PC, right-click the speaker icon near the clock and select "playback devices". Here you will see a few output devices (if not, you need drivers for the HDMI output). Just left-click the HDMI output (sometimes just called digital output) and click the "set default" botton.