I purchased an I phone 2g 4gb off of ebay and have not plugged it into my pc yet but when it is plugged into the charger nothing apears on the screen. The cnharger changes from green to red and nothing happens. Next if I hold down the any combination of buttons i get no response from the unit. Is it dead? Does it need to be plugged into itunes to even show anything on the screen? Help my poor Noob self!!