So i was restoring my iphone, erasing all data and content, but it was taking a very long time. I was stupid and was impatient and held down the sleep/lock button to turn the phone off. after that it will not turn back on. I have tried hooking it up to my mac pro via usb, as well as to the wall power via usb.... no luck. it shows the silver apple logo after pressing the power button but it goes away after about 5 seconds..... any help, ideas? Thanks!