My iphone's battery died about an hour ago, plugged it into my computer's USB port (as I normally do to recharge) and all I have gotten in the past hour is the charging indicator (iphone doesn't show up in itunes). Before I take it to apple to see if the battery is dead, anyone know why this is happening? I did a reset (held down power and home key at same time and nothing happens, screen just goes black and comes back to red charging indicator.