Check the path of the cables. The cables must go through a cable modem for the connection to work. If you moved the computer but not the cable modem, the signal won't work properly, and may be what's giving you the signal.
Also, make sure that you plugged the internet connection cord into the same location in the computer rear. I have a DFI Lanparty board and it has 2 Lan connectors in the rear. If you plugged it into one, then used the other after moving it, but the second doesn't have drivers installed, it won't function.