2002 Other Mitsubishi Models 2002 Mirage won't start

My Mirage was running a little rough and hesitating when I tried to start it and finally it just won't start. We've replaced the plugs, wires, fuel filter, distributor cap, and rotor and nothing has help. We also had someone change the fuel pump and computer control relay but no luck. He disconnected the injectors and the car almost started which he never saw before. We're all puzzled and thought it may have something to do with the computer board but we can't locate it. Do you know where the computer curcuit board is located on a 2002 Mirage? Do you think this is the problem or do you have any suggestions?
automatic / 1.5 engine