Your All-In-One is not disconnected from the power source or is not turned off. Check the cable connection.
The built-in factory installed network interface is not disconnected from the network. Refer to your adapter documentation for information or call your network administrator for help.
Your USB cable is not disconnected from the optional external network adapter. Check the cable connection.
The optional external network adapter is not disconnected from the power source. Check the cable connection.
The printer software is installed correctly:
From your desktop, double-click the 5200 Series folder.