Give us a proper description of the fault and someone might be able to help, "wont start" tells us nothing.
Does it turn over on the starter?
Does it sound different, faster, slower than before?
Is the battery fully charged?
Any flashing dash lights when you try to start?
Is the remote locking working?
Have you double checked there is petrol in the tank, dont trust the gauge?
Have you checked the cam belt?
Was the car running well prior to this?
Have you checked the earth cables?
Was anything done to the car prior to this fault, were you under the bonnet at all?
Have you been trying to jump start the car, or used your car to jump start another?
fred, November 2009