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This is a common problem. I have been through three. Don't try taking it apart to clean it. It wont work after you put it back together. I know I tried it with my first one that messed up. All you can do is buy a new one. A more expensive one worked for me.

my bro basically performed "legend of zelda" on a laptop with a 10$ gamepad it labored like a allure... san andreas must be fantastic too, basically make shure u get the appropriate gamepad...or the main appropriate adapter..