Thanks Rossco. After reading your response, I tried to run the car with the PowerFC plugged in and when I turn the ignition on, I get a continuous clicking sound (relay??) coming from behind the driver's side dash. The Radiator fans are also on and I know the car hasn't ran today, so temp is cold. There is also no CEL or Fuel Pump priming sound and the car does not start.

This car does have a factory key immobiliser fitted.