Projectors don't recognise my iPad
I used to play keynote presentations via iPad linked to a projector using a VGA connector without problem. All of a sudden projectors have stopped recognising it and say there is no signal - including ones I've used before and that I know pick up other devices. I don't think I have changed any settings and if I have don't know what to change back!
Anyone any ideas about how to resolve this?
iPad 2, iOS 6.0.1