Cox contour 2 client box not working

I had to unplug my large contour box to put in a new media cabinet.  When I restarted it, my smaller "client box" in another room, stopped working.  It kept telling me to tighten the connections and I've done that but I get an error message every time I reboot it.  I've traded the box in for a new one and am having the same problem.  I switched out the HDMI cable and the HDMI port on my television.  I've done all the simple fixes but nothing is working.  Can the large contour box be keeping the client box from working?