Thought my screen replacement went great, until I tried turning it on...

Title says it all. Installled a new lcd screen the other day, which I thought went great but obviously not. I didn't force anything, and it doesnt loook like I forgot any connections, but the damn thing won't turn on. The charge light comes on if I plug it in but that is the extent of its functionality. I realize there is risk involved in a repair of this nature, but I just can't figure out what I did wrong. Diagnosis may be out of the question with that limited info but any tips would be greatly appreciated