HT1721 computer does not respond when connect to HDMI TV monitor

macbook air does not reconize monitor from HDMI TV

help in troubleshooting Macbook to Sony HDMI... I  HAVE had the miniport/ HDMI cable connection working - I just plugged it into both ports and it worked - i.e. No fussing with "settings". Now, after kids hooked up Wii game – computer to TV does not work…
My <system preferences> -> Display -> detect displays does not register any connection [alert: the arrangement tab of Display preferences is hidden because you only have a singe display attached to this computer].
Q? is it the computer that does not recognize hookup or is it the TV that does not recognize the hookup?
I have done all the standard go online for answers: reboot both, turn off both, connect cable, check input to HDMI, reset PRAM,
Still no success…
Your suggestions …??

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