Original post by: Jeff Mc ,
Do you still have the old screen? If so try that again to make sure its not the screen. Also what i would do is unscrew the LCD ribbon plate and see if that changes anything. Its not a blue screen so luckily its not a issue with the mobo (I hope for you). If its still the same issue you can get to DFU mode by unplugging the Battery and holding the home button before plugging it back in.