Hi there,
For the car to start, the ECU must recieve an “okay” signal from the imob unit. This is acheived by a matching imob and key set. The ignition barrel is a sinple switch, nothing special about it, however if you removed/replaced this, its possible the wires to the key reader or imob were damaged and this will not allow the key to be read. In turn the imob will not pass on the “okay” and the ecu will not allow injectors to fire.
Re-check what you have changed, test power supplies and connections.
FYI this has been covered before, check out some of the other theeads with the same name for more quick and easy info incase no one is able to reply.