Castelgarden ride on mower will not start?

Hi

I have a CastelGarden 10.5/72 ride on mower with a 10.5 hp Briggs & Stratton engine. We used the mower for a bit the other day but when trying to start it up again nothing happened. It has a new battery, the enigine turns freely when turned by hand so I am thinking that it is something to do with the sensors that imobalise the mower or a fuse ?

any thoughts ??