[TiVo Central] No guide

[bmcmicking01]

I have two TiVos at my house. One of them no longer displays the 
programming guide when prompted.Or,I should say the outline of the 
guide is displayed, but all the channels show "to be announced".
The other TiVo displays the guide just fine.If I want to program a 
show, I have to do it manually.Anybody have any ideas?