Hi there, I have searched all over and couldn't find anyone with the same problem as me.. I have an iPhone 4 running iOS4.1 and a Mac with Snow Leopard. Just tried jailbreaking with greenpois0n and got it into DFU mode, and the white screen came up on my iphone, but then followed by the apple logo and the 'Connect to iTunes' screen. I've retried with greenpois0n several times and cannot make it work! Is there anyway I can still jailbreak without having to restore my phone? Many thanks, Michael.