It sounds like you have an S3 or an HD. There's a well-known bug with those models when attached to tuning adapters which results in Tivo garbage collection processes failing to complete, which eventually leads to no guide data. If you have an S3 or HD, there are two workarounds for the GC issue. 1. You can simply leave the tuning adapter unplugged until the GC process on the system information screen shows a current date. 2. You can disconnect the Tivo's internet connection until the GC process on the system information screen shows a current date. There are several threads on this issue in the S3/HD forum, but here is one from July 2011: http://www.tivocommunity.com/tivo-vb/showthread.php?t=472857&highlight=connect+guide The commonality between the "no suggestions" issue and the "GC failure" issue is the tuning adapter. The problem for those of us on SDV systems is that the tuning adapter is not optional--without the tuning adapter we cannot properly use our cable service. But as soon as we plug a tuning adapter into a Tivo all sorts of things break.