Does anybody know why my 721 remote's Select button won't work on any of my three Sony TVs ? I enter a two digit channel number then press the Select button but the TVs do not respond. (The Power, Channel Up/Down and Volume buttons all work fine). This works on my 4000, 5000, and 6000 remotes with no problem. I have tried all of the Sony TV codes from the Dish 721 manual to no avail. I even tried another 721 remote. Come on Dish !