Samsung HD TV USE AS COMPUTER SCREEN

I have a samsung hdtv that I want to use as a computer screen for my laptop and have purchased the vga to vga cable but when I connect them and choose the pc option the tv screen remains blank... what am I doing wrong?
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More about samsung computer screen
  1. Did you setup you display settings to output to an external monitor? Most laptops have a quick key that will allow you to switch to the VGA output. This can also be done by changing your monitor in the display settings in the control panel.
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