Received my arducopter last week finally had it almost finished today except when it came to testing the motors before putting the props on, the left just twitched when I upped the throttle then stops. Also worth noting is that it doesn't beep when I power everything up. I switched two of the ESCs around to check there and all was fine, so definitely the motor.
therefore my question is was I unlucky getting a dud and need a new one or did I do something wrong when calibrating if so how would I reset everything so I could have another go?
thanks in advance