My xbox 360 controller wont work..respond to my 360?

Question

OK so i went over to my friend's house to play cod4.......i brought my wireless controller and it worked fine. then when i bring it home and turn on the controller and try to sync it with my 360 it wont work right. I changed the batteries........but all i see is the light on the controller blink and nothing shows up on the 4 quadrants on the 360 power light.

Answer 1

push the little button on the very top (not the big button that turns it on but the one above the battery pack) to sync it

Answer 2

also push the little button on the xbox itself ( on the front next to the memory card slot)..but im guessing you already knew this since you synced it to your friends box...