I now have a new iphone, but i still use my old broken one at times when i need it. But everytime i drop it , it tells me i have to restore the iphone. once i plug it into the computer it wont turn on, it only turns on when its plugged into the wall. then it keeps shutting offf and on. i have been told that when you plug it in into ur computer u have to hold down the home button, but i broke my home button so i doesnt work. this happened once before but idk how i got it to work. how can i restore my phone?