R H - you're a jerk. Your most unhelpful answer doesn't deserve the webspace its consumed. In future if you have nothing useful to add to a post ...don't bother. All you've managed to do is disappoint someone and advertise loudly that you are a jerk.
Philippa, I assume that you have checked or replaced the batteries in your card as this may be the source of the problem. It may also be worthwhile pulling the ignition fuse and re-seating it as corrosion in the fuse contacts could have occurred, although this is less likely. Good luck.
regards, Graham
Graham Jones
April 2013