Why does my monitor display resolution change when i add a second monitor?

My main monitor is connected to my graphics card, my 2nd monitor is connected to my motherboard. When i plug the 2nd one its shrunk (the two black lines top and bottom) but its set to the right resolution. Main monitor is connected with DVI and 2nd monitor is connected with VGA. when i plug my main monitor out then... show more My main monitor is connected to my graphics card, my 2nd monitor is connected to my motherboard. When i plug the 2nd one its shrunk (the two black lines top and bottom) but its set to the right resolution. Main monitor is connected with DVI and 2nd monitor is connected with VGA. when i plug my main monitor out then 2nd monitor goes back to normal...Send help.
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