HDMI cable problems

We have an HDMI cable hooked up from new Toshiba laptop to flat screen but nothing shows up on tv. We have selected FN/F5 and chose LCD + HDMI Extended. We have restarted the computer... what next?
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More about hdmi cable problems
  1. Go to your graphics display drivers, and select it to display on the external monitor. What kinda of graphics card does it have?
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