Picture wont show with hdmi

Hello, I am slightly new to the whole PC HMDI hook up thing. First, I hooked the computer & my screen wasn't displaying. So I plugged in the HDMI hook up & went to the Graphic options on my computer & changed it to Digital TV. Now my computer is displaying a black screen every time I hook it up to my TV & so is the TV. I know that it is receiving some type of signal because every time I plug the HDMI hook up to my computer the TV flickers and so does my computer. Any help would be awesome!!!!!

Computer: Gateway (laptop)
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More about picture wont show hdmi
  1. Did you use the proper keyboard combination to activate the external display?
  2. Hi it could be that your not on the right channel i know this sounds silly but its very common so make sure you are as most tvs have 2 HDMI connections.

    Check your cable and your connections and you say your using a HDMI? is it a HDMI to HDMI lead as i know very few laptops witch have a HDMI output.

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