I've connected 2 monitors to my laptop, one via hdmi and the other via vga. I can get any 2 combinations of the 3 monitors working (the third being the laptop display) but I can't get all 3 to work together. Will it work if I use a usb to vga or do I need some sort of external graphics card. I'm determined to find a way of doing this using my current laptop. If I can get the 2 external displays and built in laptop monitor all working then I will be adding a third monitor in place of the laptop screen.