tv - pc popping noise

We get a popping noise in our tv and our pc speakers when certain things are turned on or off in the house. The items that affect the electronics are on separate electrical lines to the breaker box. We have had an electrician run two new lines to the pc and tv with a new breaker in the box. Still have the popping sound. This is not a quiet pop, it is very loud. What could be causing this?

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Thank you. That is extremely helpful.

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