Ok, so here's the problem. I was at work today, and a friend of mine jailbroke my Verizon iPhone 4 (iOS 5) using redsnow. It rebooted, and it was fine. I tried installing an app from Cydia, it worked, and rebooted. It got stuck on the Apple logo. My friend told me to do the DFU thing, which seemed to work. My iTunes was downloading 5.0 again, and I had to leave, so I just left it downloading. I came back, and the download was like it never happened, and my iPhone is COMPLETELY unresponsive. It won't turn off, won't do anything. It is stuck a lit black screen. I've tried everything I can think of or google about, and nothing is working. HELP!!!!!!!