i, for the first time jailbroke my iphone 3g yesterday, it was on os 3.0, and was working fine, its now frozen on the pineapple when starting up. it was fine, until i tried to install an mms app, then it said reboot phone, nd has been stuck on the pineapple ever since, so far like 2hours, ive tried to restart with the home and power button, and tried to put into dfu mode, but nothing works, when i plug it into my macbook, it does nothing, if anyone can help, please tell me what to do