HDMI problems

I was watching movies on my HDTV by hooking an HDMI cable from my HP Pavilion DV7 laptop to my HDTV. Today I get no interface when I plug the laptop in (Screen on TV says "no vidio signal") How do i know if it is a prob. with the HDMI connector at the Laptop, or the cord itself, or a software issue. I can't get a signal if i Jiggle the cord.
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More about hdmi problems
  1. Does video show on the notebook's screen?

    Try the following procedure:

    1. disconnect the HDMI cable
    2. reboot the notebook
    3. shut the notebook down
    4. reboot the notebook
    5. connect the HDMI cable and attempt to get a signal.
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