why wont my piaggio nrg mc3 04 plate start?

ive have a nrg mc3 which i only brought about 2 weeks ago its been running like a dream. nice sound and good speed, i havent ragged it either, i used alot of the fuel that was in the tank riding it around. but it was still running fine. i put it in the garage over a couple nights. went out this morning started her up and she ticked over lovely thn it decided to stop due to fuel i think i topped it up and now it will not start..? weird!! doing my head in though as i need it soon. any one got any ideas cas i dont wanna spend a bomb if its just gunna keep dying? help someone please! :)