Internet disconnection

When I connect Ethernet cable from WD to router , internet connection is lost  when plug out is reconnected . This disc was disconnected for few months . Now I can not manage to connect to router again . When connected on cable not even visible in Router’s settings ,  is from EE in UK . I completely do not know what is going on . Has anybody similar problem ? 

I’ve got My Book World Edition

Hello, have you tried to access the My Book World connecting it directly to the PC? You might want to setup a static IP.