Network cable is talking about the Ethernet Cord going to the Modem/Internet Box OR Router you are using with the laptop.
BEST OF LUCK!GOD BLESS!
Well if this is internet related you can fix it yourself by plugging in the ethernet cable/cord into the laptop and see what happens or turn on the wi-fi/wireless to make it go online/internet to see if that takes away that message and if it does then you know what it means now when it says that.
This is the Ethernet Cable.
Goes in the Ethernet Port on laptop.
Picture of what it looks like - http://www.3dretreat.com/reviews/netgear_bridge/images/bridge_ethernet_port.gif