Yes, best bet is to utilize the DVI/HDMI/DisplayPort on the card itself. Also, do you have a driver
for that particular card? If not, I would go and get one from Nvidia's website before you fiddle around with it. There are some rare cases where you have to go into the BIOS and switch it from the iGPU to dedicated card, but let's try it this way first.
Go to Nvidia's website and download the appropriate driver for your card and operating system.
Install the card and plug your monitor directly into a port on the card
If that works, install the driver you downloaded for the card