Background. I have a Iphone 3gs the battery went bad so i got a new battery the apn on the new battery was 616-0431 my phone had apn 616-0435 so i got one with 0435 and still the same thing. Also I tryed the screen on another 3gs and it works just fine. Problem. the screen on the phone stays black no apple logo no nothing it will not connect to Itunes unless i put it into dfu mode so I did and i get error 1600 or 1601,1602 every time. If anybody could help me with this i would be forever great full. Sorry if this is in the wrong thread!