Not sure of your problem either. Spliter cables are used to split one picture amongst two displays, such as one for monitor and one probably for a projector. Doesn't your grapgics card have more than one output port? Most graphics card come with a DVI-VGA adapater so you could plug both into graphics card and set them to cdisplay the same desktop or dual screens. DVI-D uses the same plug as DVI-I and would fit in that port. It's just that DVI includes a cross shape pin on one side dedicated solely to carry a VGA's analog signal as DVI is digital.