Can you please check if connecting to a different USB port has windows recognize the board? Easiest way is to open device manager and see if the list of devices is refreshed when connecting the board. Note that video requires quite some current so not all USB ports can be used as some PCs have current limitation that prevents board to work. Also, please try doubletapping the button on the board immediately after plugging the board. You should see the led "breathing". If this is the case the board is alive