Ok, so here is my problem. I have an iphone 4 and its not working or charging at all. Screen is black but when i hook it up to the pc, itunes pop up tells me i have an iphone in recovery mode. I try to install original 5.1.1 firmware but get error 1600.. i try different methods but nothing. I tried different things due to that it was not charging. I took the battery out of my working iphone 4 and still no power or charge. I decided to take the battery out again and i hooked it up to the pc and itunes popped up and said again, iphone found in recovery mode. I dont understand, it does not have a battery and its still found??? I dont know what the problem is. Is the motherboard fried?