i jailbroke it and i did step seven of the redsn0w. after to do the go, /exit thing it just sits at the apple logo thing and wont go anywhere. i re jailbroke it and it duz the same thing. i let it wait there and it just shuts off and i have to put it in DFU mode again. i rejailbroke with a brand new hashed IPSW and it still does the same thing. what should i do?