No sound from hdmi

I have a evga 250 gts hooked up to a hdtv via hdmi cable. I am unable to get sound to the tv. The audio from my pc speakers works just fine. It worked with my previous gpu(radeon 2600). I dont understand. Its not even appearing under playback devices. Any help would be great. Thanks.
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More about sound hdmi
  1. Did you connect the internal Spdif cable to your motherboard?

    ATI cards have an internal sound processor. NVIDIA's do not, but using the internal cable, can pass whatever sounds normally go through the speakers though the HDMI connection.
  2. I have no uspdif header on my mb....
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