Ati hdmi audio not working when plugged

My ATI HDMI audio cord was working just fine, then all of a sudden the audio does not read on my tv, when i connect it, my computer says that its not plugged in, if somebody could give me a step by step detailed information , please help,,,
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  1. Plug in your HDMI cable into TV and computer,

    Go start> control panel> Sound > in the playback tab you should see HDMI* > right click > set as default device > apply. Done.

    *it may come up as AMD/ATI HMDI or some variation.
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