Answer to "Xbox Powers on and immediately powers off"This fix works 100% for me: unplug your power brick and look towards the male plug. Next *carefully* widen the space between the two male plug to make a tighter & more snug fit when you plug the power cord female end in again. I discovered this , as noticed that if I listened carefully, I could hear arcing (snaps) as the cord was moved even sightly and the problem would manifest itself (aka power down). When I performed the above-mentioned fix, it is good-to-go! Good luck and again, be careful not to break those male plugs on the input of your power brick.