Diesel or petrol?
Was it running OK prior to this?
Are you sure there is plenty fuel in the tank (fuel guages can be wrong)? If in doubt, stick in a can full.
Is the car near a strong radio source, eg phone/telecomms mast, police station, radar installation etc.? Try pushing it up the road a bit.
When it is turning over does it sound different, faster or slower? Check the cam belt.
bamber, November 2009