11 Amp Powervar isolation transformer power conditioner- the kind used for hospital equipment and that has a robust RF and surge protection. It is however, plugged into an 8- outlet. I have a computer nearby on this circuit with a 27" monitor connected by DVI and it has not been affected. And in some way, that elderly ballast- possibly in some kind of failure mode- is causing some kind of intense RF interference when switched off that is interrupting the HDMI signal or there is some capacitor discharge that is it is simply making an undervolt -or surge on the circuit. I think the important factor is that the light is a fluorescent and with a miraculous ballast that is 45 years old- the same age as the house. What I think is going on > The TV, Samsung Blu-ray, and the light are on the same electrical circuit- and in fact the light and the TV are only about 6' apart- but with two walls in between. If it's playing a disk, the sound does not go off. In some cases- 1 out of 10, when the monitor returns, the sound is lost and I have to cycle the Samsung off > on and restart Netflix. When I turn off the light in the bathroom, the monitor can go off for several seconds and then returns. The TV and Blu-ray player are plugged into a reasonable quality and recent surge strip. In my example I have a Samsung Blu-ray player with WiFi that streams Netflix to a 32" LCD TV via HDMI. Your description of a computer monitor blinking off when a light is turned off is very similar to the TV monitor in my bedroom. Javacookies and other victims of the mystery, So what's up with that? I'm also worried that it could be a serious matter. There are two lights near my PC but only the one in our living room triggers the blinking. Since I replaced my VGA cable with DVI, my monitor always blinks for about 1 second whenever I turn off a particular light.
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