UPDATE: After lots of research and testing, I found out that the camera connection was the answer to my ERROR (9) problem. Luckily I was able to return the display to iFixit and get a replacement no problem. Plugged the new one in today and it works great. This repair, except for the hiccup, was not very hard as long as you take your time!

Replaced battery and display, will not reboot. Apple comes up and then shuts down then starts up and shuts down. Only ever see the apple logo. What could be the problem?

The hardest part of the whole process was getting the adhesive off. The second hardest part is controlling those tiny screws! Otherwise this repair is a breeze!