Peugeot speedfight wont spark immobiliser flashes but wont turn off *HELP*?

hi i have a peugeot speedfight that wont start. i put in the key turn the ignition and the immobiliser flashes twice but then goes back on. the batery isnt flat as ive also tryed bumping it of my mums car and all the other electrics seem 2 have worked fine. any suggestions would be appriciated thanks.