ububtu + denon amp + wont display on tv

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http://askubuntu.com – i have 2 computers with ubuntu 12.04 on them : 1 : laptop - Sony vaio - model vpcsb with ati card 2. pc - with nvidia GT 430 graphic card when i plug in the computers directly to tv (through HDMI) the both computers works fine and i can see the display on my tv (Hitachi TV) when i use my denon amplifier the ubuntu wont recognize it as display and i wont get any display on tv (on both computers) any ideas for getting it working will be appreciated! thanks. (HowTos)