Where and how to install home button when no retainer?

Two things:

#1 So my home button doesn't work. After looking inside, the retainer that houses the home button ribbon cable isn't there (please see uploaded pictures - resolution slightly fuzzed). What are my options.. how do I affix the end of the cable to its contact point without the retainer? Is there some adhesive or creative solution to pin it down.

#2 I ordered a new digitizer/lcd display assembly, battery, among other things. After installing each part, the iOS won't boot. I don't get the silver apple logo when pressing the sleep/power button - just a black screen with backlight for a few seconds. When I plug the phone via usb it's able to sync and communicate with iTunes. Very frustrating. Your thoughts on solutions much appreciated.

Thanks!