Can't Start My 370

dinfire

This morning when I started my 370 it chugged a little before it turned over. I drove it to work and parked it. Went to go to lunch and the car won't do anything. There's a yellow "key" icon to the left of the gas gauge lit up, and a red silouette of a car with a key in the middle of it next to the tach that lights up. I thought maybe my fob's battery had died so I had my wife bring the extra over that has never been used. Same deal. Still won't do anything. I put the fob into the hole to the bottom left of the steering column, but nothing happens and the same lights still appear. Any ideas? Is it a dead car battery? The fobs still work for locking/unlocking the doors. Doesn't seem like it's a dead fob battery since the extra key won't work either. Thanks in advance.