What if your Xbox controller is not connecting with your Xbox?

Answer 1

Have you tried holding the synchronizing connection buttons?

Further explanation:

First find the synchronize button on the Xbox 360 controller, it is next it's power port. (top of controller between the LB and RB buttons) Should have a ))) symbol next to it.

Now find the synchronize button on the Xbox 360 console. It should be either underneath or to the left of the disk tray. (depending of how you position your Xbox 360) And it should be found to the right or underneath the Memory Unit B port. (again, depending on how you Xbox 360 is positioned)

Now turn on your Xbox 360 controller and your console. Hold BOTH synchronizing buttons until the the power lights on both the console and controller, flash/spin at the same time.

If your controller persists to flash (after being connected) then it is out of batteries/charge.