i jailbroke 3.1.2 and i was changing the password on my facebook app and then it stopped working so i hard resested (held home button+sleep button). Then, it just kinda stopped so i restarted. ever since then, it doesnt turn on. it shows the apple silver logo and then turns off a lil while l8r. im gonna try to kill the battery and then dfu mode in 2 weeks (my friend is gonna try). any suggestions?