If the indicator light reacts (stays solid or off depending on when in the sequence the trigger was pulled) then that means the optical eyes on the board is working but the solenoid is not. Make sure the wires are all contacted properly. If they are, you may need a new solenoid.
If the indicator light does not react (continues to blink methodically), have you adjusted the trigger positioning?
If trigger has not been adjusted, the optical sensor on the trigger has gone bad and a new board will be needed
If the trigger has been adjusted, readjust the trigger first to make sure that the trigger is crossing the optical sensor.