Why is my TV not catching the digital signals?

Why is my TV not catching the digital signals?

I have a Samsung UN46d6420uf LED 46inch TV. It is 2 months OLD. i have 3 devices connected to my TV all via HDMI cables. Till last week there was no problem with the TV to display the cable's HD channels via HDMI cable. After a recent storm in Louisville, My TV is not catching the Digital signals from the cable box and not sure what happened with it as the TV displays "No Signal" Error message. I tried the following and everything was vain.

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