[wilf]

The electronics may not let the bike start if its not in neutral (of if it thinks it isn't in neutral)

Check its not in a false neutral (can be between 3rd and 4th)

or

The neutral light switch may have got stuck, if you put it into gear (you may have to roll the bike back and forward a bit to get it in) then it may click it back into life.

when the neutral light then comes on, the fuel pump should prime and your off!

good luck.