So I jailbroke my iphone 4 with 4.2.1 and now every time I try to turn it on...it stays at the loading apple screen. I have to go on my computer and do the start teatherd thing for now every time I turn my phone on and off. I tried to restore it on two different computers and even tried downgrading my software but I always get an error. Please help! What do I do!? I don't want my iphone to be fucked up 