Hi David.
Thanks for posting on the forum.
It is possible that perhaps something has come loose from your ActivBoard if this has happened previously.
What model of ActivBoard do you have?
Do you have any wall boxes or connection plates currently being used? If so I would recommend testing a known working USB cable directly into the ActivBoard itself, depending on the model you can connect directly into the back of the ActivBoard roughly where the LED flame is on the board. This will confirm if there is a fault with a loose or faulty cable.
Does the ActivBoard have power to the LED flame? If so, what colour is this and does it change when your pen touches the board?
I have created a Promethean technical support case for yourself if you wish to contact us directly regarding this issue. Please quote: 00430074.
I look forward to your reply.
Adam
Promethean Technical Support