Hi all --
I appreciate all the suggestions -- took me a few days to get to it : the Pacific Northwest is having a heat wave, and I had some preparation to do -- and NOW is a good time to stay indoors and work on my computer!
I took it apart again, however somewhere in between I read (I think in the Lenovo Yoga2 Pro hardware manual) about the torque requirements for the various screws. I did not find anything damaged or not fully connected -- however, using the proper torque on the screws on reassembly, everything works again! hopefully this will help someone else!!
-- Jo D