[Alan Anderson]

Free-turning servos can indicate no power getting from the backup battery to the pwm port pins, but they are also a symptom of the RC being disabled. That'll happen automatically if there's no communication with the OI. Make sure you have either a red tether cable between the OI and the RC or a pair of functioning radio modems connected. If you're using a competition port dongle, make sure it's not disabling the robot (the yellow light on the OI should be off).