Have you tapped the neck of the tube - and wiggled the connector?
If you try this, please wear a suit of armour* and do not use a hammer. Well, not one made of metal.
*Please use the type of armour seen in Starwars as this is non-conductive. AND HAVE THE VISOR CLOSED.
If this procedure does not appeal to you, give the FSL a call and see if he'll come out of retirement. I have a feeling he'd know just how hard to hit a CRT neck.