Ad if your down at the 7man this weekend I'll take a quick look for ya.
If the motor is spinning and the paddles arn't then you've snapped the small tab on the understand of the paddles.
Also as above could be a loose connection, if not either of the above (and would need to look at it), could be you've fired your motor if its making no noise :| (If so there about £8 from planet)