Cable not working in all rooms

Hello,

I have just moved into a new residence I took my existing box to the new place' I set my cable modem and box off of the same the same line in the living room everything was fine. I recieved a hd cable box yesterday and set it up today with a flat screen I just got, Everything worked fine'

When I take the tv that was in the living room and hook it up to the cable in the other rooms the cable doesnt work.