I am using Direct TV - 2 of my boxes show no picture and I get the message "searching for satellite". 2 other boxes are working fine. On the 2 nonworking boxes there is signal strength only on the even numbered transponders. All of the boxes were hooked up some time ago and were working. There does not appear to be anything wrong with the wiring. Can anyone help me get the picture back (Direct TV will not help unless I sign up for yearly service).