my ford mondeo will not start?

Hi,
I have Mondeo 1,8 which is little over 2 years old now.
It has the same pheomenom. Cannot start with start motor but fuel pump etc. are running and battery is full. That has happened two times during last month. However it will start when pushing it and put 2nd gear on. After it has started by pushing and shut down again. It starts normally.
Ofcourse it is a bit risk to use it because never know when it does it again

Heikki
March 2009