iphone 4s wont restore at all

My ipone 4s wont restore in itunes. When i connect it, it goes through the update the when the restore happens it does'nt work. I get the 4000's errors like 4014. The phone has a black screen and when it is plugged in, the flashlight is always on. I have tried updating itunes, using different computer, and different cables and usb ports. Nothing works. I would really like to know how to fix it.