Most Parashara’s Light hardware keys have a small red or green LED. If the light is off, the USB port isn't providing power, or the key itself is defective.
Sometimes, security software flags the license verification process as suspicious activity. parashara light 9.0 hardware key not found
If you are using the version of 9.0 that does not require a physical USB key (Software License), the "Hardware Key Not Found" error usually implies the has crashed. Go to http://localhost:1947 in your web browser. Most Parashara’s Light hardware keys have a small