Horizontal lines across screen picture going fuzzy in and out and then no picture at all
A horizontal line that rolls from the bottom to the top of the tv could be a Hum Bar. This is from a bad ground either for the house electric system or for the cable system. By code, these grounds are supposed to be connected (bonded) together. In other words, the electrical interference is going through your tv instead of into the ground. Fuzzy picture is usually from low cable signal. This can be due to bad cables, connections, or splitters or problems outside with the drop (cable line outside that runs to the house). Splitters, by design, lower the cable signal (i.e. a 2 way splitter cuts the signal in half). If you have unnecessary splitters you should remove them. If you have more than about 6 or 7 tvs, you may need to add an amplifier.