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Can't display where on another monitor or tv? Did you reboot the computer after plugging in the VGA Cable. Sometimes you have to hit the FN Function Key + F1 thru F12 to get the image to display. The correct F1 thru F12 key will have CRT/LCD on it or it might have the icon of a display. Press and hold the FN function key then hit the correct F1 thru F12 Key.
The function keys (F1 through F12) are exactly that. Function Keys.
F1 generally opens a Help dialogue
F8 opens your windows startup manager when booting windows
F10/F11/F12 Can be used in some BIOS managers
These keys are dependant on what operating system you are using which will define what they do. Some OS's allow you to program these keys to open different things.
Keyboard might have gone bad. Try hooking up a external keyboard and see if they work. If they don't then you have a motherboard issue. If they do then it is a keyboard issue. If you lucky it is just a keyboard then you can get one here for 20 bucks.