Ensure you have the latest Sentinel HASP drivers installed. Windows updates can sometimes break the communication between the OS and the USB key.
Most black dongles have a small internal LED. If the light is off, the port is dead or the dongle has suffered hardware damage. Black Wilcom Embroidery Studio E2 Usb Dongle
If your system fails to recognize the Black Wilcom Dongle, it is usually a driver or connection issue rather than a hardware failure. Ensure you have the latest Sentinel HASP drivers installed
Often, if a dongle breaks, Wilcom representatives will encourage an upgrade to the latest version rather than replacing the legacy hardware. If the light is off, the port is
Knowing these details will help me find the exact fix for your setup.
Are you getting a (like "Dongle not found")? What Windows version are you currently using? Do you need help finding driver download links ?