hi there, i got a 3GS off ebay the other day (as a replacement) when i got it, it had a battery replacement, and wasn't turning on, so before i did anything i cleaned the entire board as it was just not turning on, now i've changed the battery to a 3gs one, and it is now recognized in itunes as it wasn't before. (i've put it in restore mode, and restored default software on) and the screen is entirely black? and cannot get anything on the screen, i have changed the digitizer, the docking connector, and it is reconized but cannot seem to get the lcd to light up at all? it's not water damanged, it has been dropped.. but the guy told me that before anything has happened to it that it had a replacement battery.. what can I do? I dont have another 3gs screen to spare (LCD). redsn0w also idenfities it and exploits the firmware, just nout on screen.