No lights at all or not turning over?
If no lights at all then it has to be the battery (have you tested it with a meter to check 12v?) or the main fuse.
If you have the neutral light, press the starter button and the dash lights up like a Christmas tree, then check the kill switch is on. If the dash doesnt light up like its Christmas, pull in the clutch lever and put the side stand up before hitting th estart button again.