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battery charged? gear box could be locked up, wires could be reversed trying to turn the motor backward( had a G&G MP5 the other day that had this wiring issue)
If you can't get it working on your own i can fix it for you .And did you do something to the gun, then it stopped working?
Could always go to Vanguard or some other place to get it fixed.
probably just locked up then, you can take the pistol grip off and can give the anti-reversal latch a pull without going into the gear box and it'll free the gears. just remember which way the wires went on the motor.