No HDMI Sound with GTX 660 Ti

I connected my TV as a second monitor to my desktop, but I'm not getting any sound over HDMI. My first monitor uses DVI. I have the latest Nvidia drivers. I have the default audio output set to the TV connected over the HDMI (Its shows my TV's name and says Nvidia High Definition Audio). The audio bars move up and down when there is sound, but nothing comes out of my TV. When I plug my PS3 into the same HDMI port on my TV the sound works fine. So I'm guessing it's an issue on the computer side of things, but I'm not sure what. Any ideas?
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More about hdmi sound
  1. with nvidia cards you have to connect your motherboard audio header to the card to get audio thru the hdmi
  2. Go to sound settings in control panel and make sure HDMI is selected as your primary sound source.

    I don't think you need to plug any audio headers to modern nvidia cards
  3. What if I wanted to connect my PCIe sound card to the GTX 660ti
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