Sorry to hear that you're having issues with your controller. Could you please check the following:
Does the LED on the side of the device turn on when you plug the controller in?
What color is the Leap Motion Control Panel icon in your system tray?
What does the text say when you hover your mouse cursor over the Leap Motion Control Panel icon?
What Leap Motion software version do you have installed?
If the LED on the side is black, there may have been an issue during the initial firmware update. Try downloading and running the firmware reset tool from here to see if that resolves the issue for you:
If the text from the tray icon mentions the service not running, follow the instructions here to restart the service manually: