Computer turns on, but no Display on the first monitor but the second works

Apr 4, 2018
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I don't whats happening
When I place my small monitor on the Video card, the two monitors works but when I switch places, the small one in the motherboard and the second one in the video card the small doesn't display but is there because Windows identify him. I can even navigate to the second desktop but I can see anything
Sorry about my broken English.
Thanks.
 
Solution
When you install a graphics card it disables the video out coming from the motherboard. You need to have both signal wires plugged into the graphics card.