Cable is not connected, is loose, or is damaged

The USB cable must be fully connected and undamaged for proper communication.

Make sure the USB cable is connected to the USB port on the back of the computer

The USB port on the back of the computer is marked with the USB symbol. Plug the long, flat end of the USB cable into this port.

Make sure the other end of the USB cable is connected to the back of the printer

Plug the smaller, more square end of the USB cable into the back of the printer.

Make sure the cable is not damaged or loose

Make sure:
The USB cable is not damaged.
The light is on.