Hello, my iPhone 4's screen has suddenly decided to not turn on at all while the phone is on. The iPhone itself seems in perfect working order, it syncs, updates and transfers screenshots made when connected. The buttons work, such as the silent switch, on/off and the home button when held down initiates the voice control. However the screen is totally unresponsive and off, no matter what and has been for a week now. Although after a few days of this there was one instance when I pressed the on/off button and the screen turned 'on', as in went black instead of being completely off. I can't seem to get it any further than that. What is going on? There doesn't seem to be any recorded problem like this anywhere else that I have found. Thank you for any suggestions.