Hi, I replaced my screen too and had the same issue. Touch is controlled by the top layer of the screen. http://www.ebay.de/itm/like/161955166515?ul_noapp=true&chn=ps&lpid=106
It´s very likely that it´s connecting ribbon isn´t connected properly.
I have taken off the cover, unpluged the battery, unfastened and pulled out the ribbon, put it in again properly and tight, fastened it by the clip, rehooked the battery back in, tested it and as it worked, put the cover back on.
Hope your problem can be resolved. :)