Quadcopter not taking off


I am working on a quadcopter (plus frame). Everything seems to be right - the motors and props direction, connections, calibrations. Shows no error. Motors/props spin. But how much ever throttle I give, the drone wont take off. I dont think weight is an issue because this drone has flown before with extra weight. The latest firmware has been updated. Maybe there is something wrong with the parameters. I really dont know where I've gone wrong. 


+ frame made from Aluminium

4 motors 400kV

16" props

16000mAh 4S Tattu battery


3DR GPS and compass

Turnigy 14 channel transmitter

Photo of drone has been attached


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