I am a self-confessed technophobe. I have tried to update my device and originally was getting the "no maps found" problem. Having persevered I managed to get the satnav to say "update completed" but now when i turn it on it doesn't go past the start up screen - just stays on the picture that comes on when you start it up... no drums sound etc. despite how long i leave it on nothing happens. I am using a mac laptop. Any help would be appreciated. Thanks!