Do you have any tube type florescent lights? I had a customer that had florescent lights in his office but only used them at night. We put in a wireless keyboard mouse combo and a wireless router. These worked fine until he had to work late one night. All heck broke loose nothing worked exactly right. It took me a while to put together the clues as it worked fine in the day when I was there. Turn the lights on equaled many problems. Turn then off all the problems went away. The noisy ballasts needed to be changed out to electronic ones.
Ron
The odd thing is that I'd expect the electronic models to be far more electrically noisy. Of course, they also have a much shorter life! I have a bunch of fixtures around the house with the old ballasts in them, they've lasted more than 20 years. In that time, three of about 30 have died. I've replaced them and a couple more (to keep the fixtures matching), with modern electronic ballast models. Of the six electronics ones, two have failed in less than three years, and another is cooking bulbs so fast that I'm sure it's defective as well.
