My 700i is new and was working perfectly. I had charged it, connected to Basecamp, loaded maps and could see the SD card. I got back from the trails yesterday and plugged it in and I can't do anything to get it to charge. I have tried numerous cables and power supplies. Different computers and nothing works. If I power it on I can see the unit in Basecamp but not the saved tracks and I can't see the SD card. Any thoughts?