I have a 94 Chrysler Concorde. The transmission has been acting up lately (it gets "stuck" in 1st gear), and a mechanic told me that it could be a problem with the computer. He said that if I unplug the battery for 12 hours it will reset the computer and might fix the problem. So I had it disconnected and left it to sit for that amount of time. Today we reconnected the battery, but now the car just wont start. My battery is pretty new, so I don't think it's dead. Any ideas on what it could be?