NO PICTURE ON LCD WHEN VGA CAble plugged into laptop

I have a Staples VGA Monitor Cable plugged into my 52 inch tv and my HP laptop, but I cannot get the picture to show on the TV. The cable does work with my son's HP laptop, however. Suggestions? Thanks.
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More about picture cable plugged laptop
  1. Try going into the settings and selecting external monitor.
  2. Check your TVs manual about the settings to use when hooking up a PC or laptop.
  3. or go in the bios and set display to external only or laptop and vga

    on most laptops you can toggle it by pressing fn and another key when the laptop is in windows

    connect the tv and try fn + f4 or f5 to toggle from laptop screen to tv and both
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