Tesorflow was not responded suddenly

I’ve been using Tensorflow for Notebook years with Colab, but it didn’t respond suddenly from last week and I am feaguring out why.

‘import tensorflow as tf’, gave "ModuleNotFoundError: No module named ‘tensorflow’'.
Anaconda Navigator3 has (installed) tensorflow 2.12.0 with python logo instead of Anaconda logo leftside (underdescription). Python 3.9.16 is also installed but it has the anaconda logo. I have one one environment (Root). It seems like having a conflict with a progam I installed rescently. But I can’t recall the name of it.

Appreciate your suggestion! Chuck