Macbook Pro to Television display with HDMI cords "No Signal"

I cannot get my Macbook Pro to display on my LG TV when using an HDMI/mini port connection. I have checked the input and re-connected all of the cords, restarted the computer, etc. and I still see a "No Signal" sign jumping around my television screen.
I am updated to the most recent software (OS X 10.8.2) as well.
When I open displays (in System Preferences) it has "Show Mirroring Options..." checked off but no sign of my television.
I have tried looking through all of the other discussions and can't seem to locate my problem - Help please!

Early 2011 and later MacBook Pros have Thunderbolt, which is not 100% compatible with all mini-Displayport adapters.  Double check yours is by contacting the manufacturer.

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