Need Help, touch screen unresponsive after Battery replacement

[ptgrad2004]

Hello guys and gals, I changed my wife's battery in her iphone 3g yesterday. After putting everything back together it cuts on and everything but now the touch screen doesn't work. Anotherwords I can't use the phone because I can't get it to slide to unlock. I have already tried the reset mechanism and done the factory restore on the computer but to no avail. Can anyone give me any advice. I opened it back up and it looked like all the cables were hooked up but obviously there is something I am overlooking. Which cables exactly would control the touch screen. thanks in advance, John