Help with Old JVC TV?

After reading your details I am curious if perhaps when you pulled the box away from the shelf if it may have pulled one of your wires out of the tv. If your tv is about ten years old then it probably only has a coaxial cable input in the back. I am curious if perhaps the cable wire going from the box to the tv is loose. Mostly a blue screen is indicating that you are not getting a signal from somewhere. My suggestion is to check the input cable and see if it is making contact. Hope this helps.