I have recently come across a monitor (with a vga port). I was going to use dual monitors, however, my main monitor (also with a vga port) is plugged in through a dvi-vga adaptor (as my graphics card did not have a vga port). So I plugged in my second monitor into a vga port in the motherboard, but it won't connect to my computer. What can I do? I currently have a gtx 970 and a asus Z97-A