Thank you very much It is very kind of you to reply so quickly. We are not mechanics but we do have a good, trustworthy local man who worked on our previous car so it is worth us asking him. The DVD player, which is giving us sound and successfully playing CD's, responds to the remote but we have no picture on the screen. We wondered if we had missed a simple step which will turn on the screen or if this is an easy part to replace. We have been looking in to automotive locksmiths for a spare key so thank you very much!