Question : Use old xbox360 controller on new xbox360

I have a controller from an xbox360 that is 1.5 years old. Just got a new one, and it does not seem to work with the new machine. Is the old controller not compatible ! or do I need to do something !

Answer : Use old xbox360 controller on new xbox360

Yes, you need to press the "connect" buttons on both the XBOX and the controller after powering them both on.  

On the XBOX, the connect button is near the memory slots (to the right).  On the controller, the "connect" button is on the back, between the Left and Right buttons.