Originally Posted by TimVermont
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
"There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).