How do I synch my controller to my Xbox 360, again?

Question

A few weeks ago, I used my controller with my friend's Xbox 360 at a party. I haven't used it since then, and today when I went to play some GTA4, my controller simply wouldn't synch up as it normally does. The light just flashes around the four areas of the circle and then blinks. Note, this is a controller bought separately from the system, but I cannot locate my other one at the moment.

Help? Please!

Answer 1

Click the button on the XBox 360 next to the disc drive and click the button next to the right trigger at the same time. it should work.

Answer 2

near the drive u will see a little white button and you will have one near where the wire goes into the controller hold them both in at the same time