Ok so with my Xbox it does the same thing, it turns on then turns off I've taken it completely apart and blew on it but and put everything back but it still does the same thing, turns on then off. I've also done the power box thing unplugging it the plugging it back in and I show the lights that it's supposed to but when I go to turn it on it still won't work it still turns on then turns off. Yo can anyone help me with this because it's making me hella mad not cappin.