Chosen Solution
Hello my xbox 360 controller is dropped on ground and its not turning on.
Try taking out the battery pack and re-installing it. Sometimes hard drops can dislodge the battery from the contacts (happens to mine every so often even when I just throw it onto the couch). If that doesn’t work and you are 100% sure your batteries are ok, you may have to open it up and see if a connector or wire got knocked loose. Let us know what you end up doing!