So, I ordered a white iPhone 4 replacement front cover, and I took apart my entire phone the minute it came. Of course, it was then I realized I would have to buy an entire new LCD assembly to get the white cover to work, so I reluctantly put my iPhone back together. When I put the logic board back on, the digitizer cable kept getting pinched under the screen so every time I would have to take everything apart again and make sure the digitizer cable wasn't being pinched as it was fed through the base. This took three times before it was completely out, but the cable was kind of folded from being pressed against the inside. Nevertheless, I put the rest of the iPhone back together. Towards the end, I mixed up my screws and didn't know what went where. So I had to guess which ones fit best and two holes wouldn't take any screw so I had to leave two pieces unscrewed. They seemed relatively unimportant. So, I put the rest back together and turned it on. It was then I realized the touch screen wouldn't work when touching a small section of the top quarter of the screen. When I touch there, it ignores the touch and goes to the areas around it. So I have two small rows that don't respond at all. Why is this? Is it because of the pinched cable (it's not being pinched anymore)? Or maybe the connector isn't pushed in all the way? Or could it be the missing screws? I already tried restoring the device, please help!