I'm a total newb. I just jailbroke (is that a verb?) my 3GS. Now, email doesn't work (black screen), Safari doesn't work (opens for a second then just closes) and this Cydia thing that I was so anxious to try also doesn't do anything (like Safari, just opens for a sec then closes). Did I do something wrong? Can anyone help me fix this, please? I'm using an iMac, if that makes a difference. Thanks.