Express van won't start = FIXED!

my company van would not start. few minutes later van started. took to nearest garage and noticed SECURITY light was on dash. garage owner said key and/or key ignition cylinder is worn so computer thinks i'm trying to steal van so computer disables fuel. went to dealership but their computers were down so i could not get new key. took a chance with backup key. later that evening van would not start AT ALL and i was stranded. got tow back to house. later installed NEW ignition key cylinder AND NEW key cut from van VIN code from dealership. turned key to run position and let sit for at least 20 minutes so computer could re-calibrate to new key/cylinder. van starts up and runs fine. hope that helps!