My MacBook fell about 2ft and landed upside down. I immediately checked it, turning it on, pulled up safari, made sure keyboard worked,and everything seemed to work fine, however the next day it would no longer turn on. I tried doing an SMC restart and nothing, I opened the back and disconnected and re connected the battery, and still nothing. The charge cord light turns green when I press the power button, but then goes to red shortly after I release the button. What damage should I look for when opening the Mac?