This morning I drove to my office as usual. I started off with both a full charge and a full tank of gas. The 9 mile drive to work was uneventful. At the end of the day, I came outside and noticed that the car did not respond when I pushed the remote's door unlock button. I used the key to unlock the door, and found that the car is completely dead. No lights, no dash display, nothing. Of course, it won't start. So now I have a huge "paperweight" in my parking spot. Any ideas on what happened and how to fix it???