Return and Search keys on glass do not work properly

Hello, my son smashed the glass on his droid so I decided to try and fix it myself since it's out of warranty. Everything worked before I replaced the glass. I found a screen on ebay for $30. Got everything back together and the touch screen glass and phone work. But I am perplexed by an issue with the buttons across the bottom of the glass. Though the buttons work in apps like the internet browser and messaging, they will not work with the system. I also noticed that the buttons do not light up now either. I've reset hte factory settings, reinstalled the operating system, cleared the cache, reset the phone again, still no remedy. Any ideas?