1. With the system powered on, unplug the Ethernet cable from the back of the unit.
  2. Reset the unit back to factory default with following steps:
  3. From any view press the MENU button twice to access the Main Menu then press the RIGHT cursor key until the Setup tab is selected.
  4. Press the DOWN cursor until Restore Defaults is highlighted on the Setup menu.
  5. Use the RIGHT 4-way cursor control key to initiate restoring defaults.
  6. The Confirm dialog box will appear. To reset the defaults, press the RIGHT cursor key once more.
  7. To cancel Restore Defaults, press the LEFT cursor key.
  8. Power the unit off and then plug the Ethernet cable back to the unit.
  9. Power the unit on again and confirm if the Network tab is available in the Main Menu System.

    Might gives this a try.