So you got the VGA to DVI-D (digital) that is your problem i believe. VGA is analog, DVI-D is digital and they aren't compatible. I know with my old GTX 770, it didn't have a DVI-I port on the back, only two DVD-D's so I couldn't easily hook up my old VGA monitor. I had to buy a VGA to HDMI connector and connect via the HDMI port.