I have a Toshiba Qosmio X505-Q885. It has a Nvidia GEForece 360 video card. I have extended the display to a 2nd monitor by use of an HDMI cable – works great. But I want to extend to a 3rd monitor by use of the VGA port. No signal from VGA port. I discovered a VGA drive that is not running. How do I fix this?