Quote Originally Posted by TimVermont View Post
A couple things to check:
1) the switch on the control box, both what position it is in, and that it is working
2) the "telephone jack" style connections from box to head.

I had similar problems once, but all it turned out to be was a need to wiggle the connector at the lamphead.
No luck, but thanks for your suggestions.I would look inside but the parts are riveted together not screwed