I have a Motorola QIP2500-3. Worked just fine last night. This AM I have nothing showing in the window except "O". Trying to set channel initially shows in window but then reverts to "O". Router was reset but didn't fix problem. I unplugged, then reconnected power... didn't fix problem. All I have is "O" in the window.
same thing happened to me and we had to call tech support and they had to send a code to reset the box. so there's nothing you can do by yourself. one more thing, after resetting the cable box, we could change channels or power on/off the box, but no guide or on demand. i guess that's another call to tech support. so before you hang up on tech support make sure everything works!!