1st gen Lenovo Helix won't start after fan replacement

I just finished replacing the fan and heat sink in the tablet portion with new heatsink compound.  Initially the tablet portion was working ok but the keyboard was not working.  I couldn't get anything after trying several times to reset the keyboard and the tablet.  I took the tablet apart and double checked all of my connections and when I put it back together it won't boot up now.  I've tried reseating all the cables and resetting the tablet many times and nothing is working.

I really like this laptop and would really like to salvage it.  Is there anything I may have missed that might get this working again?