Why is my screen non-responsive after replacing home button?

Hi everyone, I did search for a similar issue and I couldn't located one so I decided to make a thread.

My iPhone 4's battery wasn't holding much of a charge anymore and the home-button was becoming increasingly problematic so I decided to replace them both. I am comfortable disassembling and reassembling electronics (though I don't know how to solder anything presently) and I followed the iFixit guide explicitly.

I did not run into any issues (though I did find a pre-stripped #000 screw on the top right corner of the phone) and I took extra care to make sure nothing got damaged during the re-assembly.

After putting everything back together I plugged my iPhone into my charger and let it boot up. This boot took much longer than normal (about 2.5 mins on the Apple logo) but I figured it was just assessing the new components internally or something.

Once it had completely booted I immediately ran into a major issue. The LCD was completely non-responsive to touch. It displays fine, and the home button is clearly working perfectly now but there is zero touch sensitivity.

I don't know what I did wrong as all of the cables are attached properly but I'm really stumped over this one and really hoping I didn't just kill my phone.

Do you have any suggestions? I'm presently restoring the phone now and I'm going to set it up as a new phone to see if that helps for some reason, but otherwise I figured my only other choice is to take it in to the Apple Store.