Go400 No longer sees memory card
About a week ago, my wife's Go 400 complained that there were no maps installed and, on further investigation, the memory card was no longer being recognised. I took the card out, and checked it on a PC, which looked fine apart from the fact it said '0 bytes free'. I wondered if this was the cause of the problem, as the Go400 wouldn't be able to write to it. I re-formatted the card, and re-inserted it into the satnav, but nothing I can do will persuade the memory card to be seen. As I can no longer install the maps on the internal memory (not enough space) I'm a bit stuck! Any ideas?