iPhone Screen Unresponsive (b3)

So I was running Beta 3 a month ago when my iPhone 4's screen broke. Everything was working for about 3 weeks and then the screen became unresponsive to touch, but functional in every other way. Since shards of glass were peeling off the front of the phone every day I figured it was a mechanical thing. I sent out to iFixit for a new screen and installed it yesterday—the screen is still unresponsive.

Next I figured it must be an iOS7 bug so I manually updated through iTunes to b5, still nothing. I thought maybe i would downgrade to iOS6 but iTunes says I can't restore because Find My iPhone is on.

Any thoughts on a next step or am I screwed? haha