Hello...1) Make sure your monitor is set for the type of cable you are using... ( VGA,DVI,HDMI ).
2) Make sure your Monitor & Cable work... try it with another Computer & Video card.
3) Make sure Windows is being told to use your VIDEO card... ENABLE PCIE only in your MB BIO's, Save and Exit.
4) Make sure you are not using a Cable adapter and try plugging into all the Connectors on the Video card too find the Video signal.