When i try to turn on my xbox 360 controller it blinks twice then turns off and wont do anything it does that on 3 pairs of batteries i tried and it wont sync with my xbox 360

SOURCE: xbox 360 sync problem - controllers will not connect

maybe the only way is take it a part and see if the sync button is not broken some how. therefore i advise you to buy a new controller maybe even a used 1 if you dont want to spend more than $20.

SOURCE: xbox wont sync with my wireless contorller

Have you ever synced one of these controllers before?

Hold the controller in your hand as if you were playing a game. Next flip the controller up so that the buttons on it, are facing you.

There is a small white button that you will see. Power your xbox up and after you get to your main menu press the sync button located about 2 inches to the left of your main power button on your console.

Press the described button on the console and then the described button on your controller. The two should sync together perfectly fine.