D-sub port on my motherboard isnt working

Hello, when I first tested my motherboard the D-sub port worked (this was before my graphics card was installed), now after putting my computer together it isnt working and i have to use an adapter and plug it into my graphics card for it to work. Could this be because of my GFX card, and is there any upside to having my screen plugged into mobo vs. GFX card or should i not worry about it?

CPU: I5 3570K
Motherboard: GIGABYTE GA-Z77X-UD5H
Graphics: GIGABYTE Radeon HD 7970 Ghz
PSU: Seasonic M12II 750W
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  1. Generally speaking, when you install a graphics card you also set the BIOS to NOT use the graphics chip built into the mobo. So that D-Sub port is being fed nothing.

    I'm sure your graphics card is a much better display generator than the chip on the mobo. Usually that means you don't have any need for the lesser signal. So why do you want to get a signal from the D-Sub connector? What do you plan to send that signal to? Whatever display device that is, what other inputs does it have to use?
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