I have two Series 3 TiVos, each with 2 CableCards, and suddenly today, both stopped producing an HDMI signal. Restarting didn't help. TiVo Support suggested disconnecting the cables, waiting a minute, and restarting. No good. I connected one TiVo using component cables, and the picture is fine. Both CableCards working OK. (Too much work to connect the other with component cables.) Why on earth would 2 separate machines suddenly have the same problem?