All's well that ends well! I went to the electricians office at lunch time and my friend confessed that he forgot to tell his partner to look at my problem. We talked about it and I mentioned I found three white wires in the light box in bedroom 3 which had different voltages so I didn't connect them together. My friend said that was normal and all the whites should be connected together. The partner, a former physics student, asked if I wanted him to fix it or fix it myself. I really wanted to finish it myself after that tip!
I wish this forum would give a warning before time expires while typing a post!
The explanation is that there was a small load on one of the plugins causing current with nearly 120 volts to flow through the white wire to the light box in the ceiling. It must be connected to a white going back to the breaker box ground. I connected all three whites with different voltages together and everything works!
Lesson 1 - Remember that electricity flows in circuits, there and back.
Lesson 2 - take pictures of a light fixture wiring being replaced before taking it apart.
Lesson 3 - If you are a teacher, be nice to students who may become electricians, mechanics, nurses or doctors.
Moderator, you may mark this problem as solved, but I hope you will leave it here for others to possibly make use of.