Lcd Tv With Vga Input Why Wont My TV Pc Input Vga Socket Not Work,its A Samsung LE-37S73BD - 37" LCD TV And Displays Mode Not ...?

Why wont my TV pc input vga socket not work,its a Samsung LE-37S73BD - 37" LCD TV and displays mode not ...? - lcd tv with vga input

Hello, my TV has a VGA PC input, but if I VGA cable for PC and change the font for PC imput I receive a message indicating how not supported. Can anyone advise on how or whether my PC work with the TV as a monitor, his 2-year-old television that is not so old.