Servo stopped working suddenly. I checked the continuity of power ground and signal wire.
The servo is a towerpro micro servo 99 sg90
Bad signal to the servo (bad connection, bad code). Bad servo. Not enough power for servo.
With no circuit diagram and no code to look at it could be any of those. First thing to do is try another servo and see if that one works.
Steve
Do not attempt to power the servo from the Arduino. Use a separate power supply and connect the grounds.