for a long while my network has been running ok. i shut down the computers normally and then the following morning, two of the computers on my network stopped working! when i try to ping the network router, i get the message media disconnected. as far as i know and i checked, everything is connected and in order. please advise as to what i do next at the soonest. however, the other computers on the network can access the net apart from two of them.