Here is a list of steps to fix a network cable broken error:

1. Check the cable connection and ensure the cable is firmly attached to the device.
2. Ensure both ends of the cable are firmly attached to their respective ports.
3. Check to see that the problem does not lie with the network router itself. Run a diagnostic test and reset the router if necessary.
4. Inspect the cable for any visible signs of damage.
5. Replace the cable if a visual inspection reveals any damage to the cable.