HEELP!! Atv wont start.......?

its a mini 50cc 4 wheeler, (GIO.. i Think), i bought it yesterday off of sum1, it worked fine, took it out today it worked fine for a bit then started actin up so i came up, i cleaned it off.. then went to start it and NOTHING happen!, (he had a push start stall cuz he lost the keys so all u do t push the button). it doesnt do nothing.. was thinkin its the battery so i charged it for a bit went to try nd start it again nd stiill nothing. soo whts up?. nothing is happening when i push the button.. isnt doin ****!! and im pissed cuz i only bought it 24Hrs ago