I've spent far too much time in this section of the forum

I've recently changed the oil, fitted tyga system and upjetted the carbs on my NC30. Now I've put it all back together (I think) and I go to press the button and nothing. I've rechecked all the connections and I can't work it out! Please enlighten me 400greybikers.
What I have noticed is that my neutral light now doesnt work now.
Its doing my head in! Suggestions from everyone please!