Renault scenic 1.9DCI Won't start?

Our car was fine before the snow, but now won't start, I thought at first it was the battery so have used jump leads which did give the car power to lights, wipers and so on, but when I press the start button I get a warning saying steering lock is on, so I turn the wheel and try again and it now says steering lock Is off, but still will not start, it also now says parking break fault but I can apply and take it off, we also noticed o ce that the warning message "injection fault" but I took no notice of that cos I've had that before when battery is dead, I changed the battery recently, so can't understand why the car will not start, it's as if the start button hasn't got enough to turn starter motor? Anyone got any ideas.