Non starter

my wifes rover 400 has stopped running. the car was running fine then all of a sudden just stopped going, it wont start, it turns over, ive changed the rotor arm and the dibby cap but still nothing. the rotor arm spins and theres power going to the leads but still not firing up. could it be lack of fuel to the injection system, my neighbour is a mechanic and tried some quick start in the air filter system but im still stuck, any help or hints without having to strip out the injectors would be great, regards shane