1. Make sure that USB port is properly plugged into the socket.
2. Check if the USB is physically damaged.
3. Unplug other USB devices and see if it works.
4. Check if the USB slot is activated in the computer’s BIOS settings.
5. Update the USB drivers.
6. Try plugging the USB device on another computer.
7. Check if the USB device has a faulty cable or power supply.
8. Replace the USB port on the computer.