I updated my iPhone 3Gs to 5.1.1 and jailbroke it using redsn0w and I had installed the iPad baseband previously. At first everything went well. I activated the phone, and everything was fine until I turned it off. When I tried to turn it back on by booting it with redsn0w because it is tethered, it didn't turn back on, and all I see is green/gray horizontal line along the bottom half of the phone. Please help me fix this, thank you for your time.