Hi all -- thanks for the replys. When the screen was working, it seemed like all the TPM sensors were green (active and working or at least communicating). I did three restarts of the system in succession and noticed that the controller was able to move from the warning screen to the return arrow above! Forward push of the controller.

So for some lucky reason I was able to get out of the "freeze" and then able to follow the procedure for resetting the TPM (see posts on this procedure).

Now everything is back to normal. Happy days!