I completed this guide, but unfortunately my phone is in no better shape than it was before the dock replacement. Apparently, this was not the problem. The device won't restore in iTunes. It just sits with the Apple logo and an empty status bar on the screen. Now when I unplug it from the computer, I get a black screen, with just a touch of backlight, but no display otherwise. Before the dock replacement, it always said "Connect to iTunes" but would not restore either. Any thoughts on what else I could try now?