3gs digitizer

[kgcork1]

I have a 3gs and replaced the battery when I put the phone back together the digitizer works but there's 2 lines not working,when the keypad pops up the top line of letters and the line of letters above the space bar don't work so I ordered another digitizer and when replaced the 2nd one it's the same thing happening,there's also 1 screw missing of the motherboard,would this have anything to do with the problem?