Sorry, this is not really an answer, but I have the same problem. I have found that a small plastic 'lever', that operates a switch on the circuit board when the cover is opened, is brocken. I am trying to source a replacement 'lever' but, as yet cannot find one. I would be very greatful if anyone can point me in the direction of such a 'lever'. I know that this does not help you, but at least you know what the 'problem' is.
Brimar, July 2008