[RyanCahoon]

Originally Posted by Kevin Sevcik

*coughs* You switched the direction of the wires? I hate to break it to you, but you might have fried your servo. They don't really like being plugged in backwards. Try to get your hands on a known good servo, and make sure you plug it in correctly.

I would also recommend that you try known good servos, but plugging in a servo backwards is not likely to fry it. The PWM (servo) cable has the following signals:

(Black) - (Ground)
(Red) - (Power)
(White) - (Signal)

Reversing the cable would only lead to switching the Ground and Signal wires, meaning that - worse case scenario - the servo detects no control signal and the PWM signal may cause some weird behavior due to "dirty power," but as the voltage across the servo would never exceed the standard operating voltage, I doubt it would damage anything.

Pretty sure the cables were designed this way on purpose.

--Ryan