Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 2_2 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5G77 Safari/525.20)
I used to have an ood phone that i threw on the ground, yeah mature i know but when i did the screen went white with the same issue your facing, mine was a flip phone and it was obvious that the screen was disconnected but there was power going to it. So mabye this is the case for your iphone, screen disconnected but still reeeiving power, just ask apple to reconnect whatever,for a fee of course. But still, could be completely wrong but thats my theory! Good luck!