Failed repair, screen goes white.

I followed the iPhone 3gs front display repair guide. It went well right up until step 10 when I'm removing the Phillips#00 screws. Since the screw itself could not come off, and was worn down from failed attempts at the screwdriver, the screw became too rounded to screw out. So As I removed all the screws except for one, I dislodged it from the side part. The LCD itself and everything around is still intact, as far as I can see all I did was damage the screw to hold it in place.

So I proceed to install this onto the new display and mount it onto the phone. I manage to put the cables 1,2, and 3 back in but I'm not sure if they are damaged. After mounting and pressing the lock button, the white screen of death appears.

I suspect the damage is either from the LCD, the cables, or worse the motherboard. Please help