My controller will turn on the xbox 360 by pressing the button on the controller. But once the xbox has booted up, lights flash but the two won't sync. I've tried the sync buttons on both the xbox and controller in every conceivable combination but the two won't recognize. When synch buttons are pressed the two devices will have rotating lights and then they seem to "recognize" but they don't. Once the xbox is on the controller has no effect on it. This does the same thing whether the usb cable is connected or not.