Default [Q] Replaced Screen, Now its Black

Hi There... I'm a total newb so please excuse the lack of lingo. I cracked my screen up pretty good a few weeks back, found a video, the parts, and replaced it. I had some trouble getting the phone apart, mostly removing the chassis from inside the phone. I thought I removed the mobo without much difficulty... I'm pretty sure I did everything right!! And when I put my phone back together and turned it on... Everything worked!! Except, the screen!! Its almost completely black. I can however see the volume control and some other messages (prompts) but theyre super dim I have to REALLY LOOK HARD to see them in the dark. So, I took it apart 2 more times and made sure that all my connections are secure... It appears that they are. What did I do wrong?? Is there a solution????? Help!! Please!