Hi Chris,
From my reading of the Screen Replacement guide, it appears the digitizer has two connectors, which is unusual but would explain the problem you're seeing. If one of those connectors isn't seated right or maybe has some debris or a bent pin, it makes sense that half the screen wouldn't be working, as I assume each of the two plugs controls half the screen. Here's a picture of those two connectors.
[image|2977437]
I'd say your best bet here is to open it back up and unplug those two connectors. Get out a magnifying glass and a bright light and examine the sockets on the motherboard and the plugs on the cables for any indication of foreign objects or bent/broken pins. Once you're satisfied it's all good, clean it all with 90% or higher isopropyl (rubbing) alcohol, let it dry then reassemble and retest.
Chances are one of those plugs isn't fully seated, but check for any issues as long as you've got it open.
Once you've done that, come on back and let us know what you found. If that fixes it, great; otherwise we'll try and help you figure out what to do next.