I'm installing a samll theater system for my kids. I have the projector, dvd, ect, that all works fine. However I had a 6-7 yearold digitakl stream tuner and when I attach it to the cable feed it says it only has a 49% signal strength and willnot find a single channel. I attach one of my new TV's with a built in tuner and it finds 40+ channels.

I even tried one fo the digital converter boxed that sell at best but and it did not find a single channel. Any idea what the issue might be or what kind oif tuner I need to make this work?