Any help would be greatly appreciated. I am unsure if this is a hardware or software problem, but think it must be software as I haven't dropped my phone or anything like that recently. I was running ios7 beta 3, and suddenly the screen went black. I am still able to use Siri, and take screenshots but appear unable to unlock my phone by guessing where my pass code would be. Has anyone had the same problem? At the moment my phone is unusable.