I just tried to jailbreak my iPhone 3G (3.1.2) with BlackRa1n and when it was done, the phone got stuck in recovery mode with a little pinwheel at the bottom. After a little bit of that, the screen turned white and the computer showed it was in DFU mode. It did that for a little and I thought I'd just leave it be. Now the screen is just black and the phone isn;t really responding. If I hold down sleep/wake and home for a bit while the phone is plugged in, you can hear the computer make the little hardware connected/hardware removed notifiactions, but iTunes won't show the phone despite anything.