If my computrer show check signal cable

when I switch on the computer it shows me check signal cable, why?
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More about computrer show check signal cable
  1. remove the moniter cable from your video card or if you have a built -in VGA so do same and remove out all the rams stick for a while then put it again and plug the cable again correctly.
  2. You can unplug your monitor cable and power plug.
    Plug it all in again.
    Or else you can check your monitor menu and select the appropriate display input source.
    For example my monitor has 4 input selections.
    I'll get the check signal message until i select my preference.
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