Hmmmmmm...

My first inclination is yes, but then you mentioned that the light is on. Turning it on means you can use the control panel to switch it on from focus to print right?

Does the light stay on always or only when you switch it on with the control panel??

I did notice that in the head itself there is green and purple light. Could the controller be broken?

It seems that the control box just isnt making contact with the cable going into it...
So you can see both tubes and you can see that they are both on?

I'm not at home in front of the enlarger so I can't remember... Isn't it like a category 5 computer cable??? (mine is grey and flat but I think it has more wires than a standard telephone cable) If it is, do you have something like this on your computer?? Do a swap and see if anything changes...

Don't despair... If it is something in the controller, it seems like a very simply made unit. Someone trained in electronics could easily upgrade some dials I'm sure... Just try to eliminate as many variables as possible right now.

joe