Why is my PC D-Sub port not working?

Question

my CPU have 2 D-Sub port.
one is from the motherboard and the other one from to the graphic card.
the problem is, only the graphic card D-Sub port is working.

im sure that both of my monitor and d-sub cable is working properly..
because i have tested both on the graphic card d-sub port..

what did i have to do to make the motherboard d-sub port work?
is there any kind of switch, button or anything that maybe accidently turned off?

btw, my motherboard is "Asus P8Z77-V LX" 
and my graphic card is "Asus GT640-2GD3"

p/s: im not very good in computer hardware.. sorry if the way im describing is weird..

? · Accepted Answer

Usually when one display device is in use, the other is disabled because the computer only uses one at a time. If you have a graphics card, you don't need the integrated graphics on your motherboard. Most graphics cards have multiple ports for monitors if you need two monitors. Use an adapter if the port is different from the cable you want to use. You can find them easily at any place that sells computer parts or accessories (for example, Best Buy).

william · Answer

Which CPU do you have.  It has to have an integrated gpu in it like HD2500, 3000, or 4000.

After that download lucid virtu mvp http://www.lucidlogix.com/ that will enable the integrated gpu to give you many options.

Are you trying to run dual monitor?

Anonymous · Answer

no count in the experience that your video exhibit is being detected via hardware wizard or no longer? if no longer then port of the video exhibit is defective or DVI cable is defective examine cable first on condition that's the 1st subject to head defective.

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Why is my PC D-Sub port not working?

3 Answers