If the battery/batteries aren't charged up an automatic circuit will keep it from starting. My Gardena has this feature. The big power surge at startup can trip this protection circuit.
Does the blade turn by hand? If so, then the motor bearings are ok. The motor uses brushes as part of the electrical process--they can be worn out or stuck. Internal wiring breakage can result from vibration. Bad power switch? Open winding within the motor?
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