Tv For a monitor

I am hooking up my 46" tv for a 2nd monitor but tv says no signal. The computer recognizes the tv but that's it, still no picture. I am using a dvi-d to hdmi cable. it is a brand new computer with hd graphics card for multi display use. Someone said the cable is too long, it's a 30' cable. Any insight would be great.
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More about monitor
  1. Use the remote to change the INPUT of the TV
  2. i did that.
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