replaced iPhone 5s screen but now it won't display

Hey guys I'm stumped on this one !

I shattered my screen on my iPhone and it was no biggie because I replaced like 12 of these screens in the past with no issues. this phone is being a pain in my a**, I replaced it and went to turn it on but noting showed up, so I connected it to iTunes and it recognized it and then I grabbed one of my customers 5s and tried the screen on it and it was 100% fine . I put the screen back on my phone and still no luck so I'm a bit stumped, any thing is helpful at this point.