I recently just jailbroke my device with RedSn0w tethered jailbreak. I accidentally turned my device off, and RedSn0w requires it to be in DFU mode. I can't get it into DFU mode without the device being on. It doesn't even show up on iTunes. It still has battery and everything. If i press a button, it goes to the apple logo, but that's it. If you hold down both buttons, it turns off.