I need help.. my iPhone died last week.. It just turned off and my friend brought it back to life for an hour or 2 then died again.. I asked my friend how to do it again, but it won't turn on. I've tried holding both power and home button and releasing power after 10 seconds. I've tried plugging it in a restoring it, but while it's restoring it gives me error message 1600. Any ideas or suggestions?