Have a 2003 4.4 Vogue. When key put in ignition, key will not turn past position 1 - just has 3 electric attempts and then is locked. I am aware that it can be a battery problem, but has just started and after initially fixing itself upon attaching a set of leads, now will not start for love nor money, despite the battey appearing to be good - any other ideas as justr come out of nowhere. Is it just a new battery needed or is there a common fault.