2001 Saturn L200 car will not start

Electrical problem
2001 Saturn L200 4 cyl Two Wheel Drive Automatic

i drove the car al day the other day and pulled into a store parking lot. I shut the car off. When I had gotten inton the car to leave it backed up than I put it in to drive than I lost all power. The lights, stereo, and wipers etc. Work. We replaced the coil but that did not help. We have fuel pressure but it still will not start. Help.