Hi David (thinkpadx)
Thanks for the info. I thought the transformer I used may not have been the right one as there is no connection on the majority of transformers as to which piece of hardware it partners - except the voltage if it is shown on the parent machine. I have about twenty transformers kicking around and am gradually labelling them. I tracked down the problem to a faulty USB cable, now it will work.
I really appreciate your prompt reply.