My iphone 3G is having problems,,i had my phone connected to itunes and my phone started ringing but the screen still showed that it was syncing so i pushed the turn off button and it turned off.. well then i went to turn it back on and all it would do was turn on to the apple for about 2 min then turn off again...i cant get it it to turn on completly...i left it pluged in all night and got up this morning and still doing the same thing idk whats worng....PLEASE HELP