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Cheap computer power supplies generate electrical noise. Better quality ones don't. I had a laptop where the touch pad mouse behaviour was erratic when connected to a cheap eBay charger. Replacing it with one that cost twice as much fixed it.. PSU electical noise also messes with homepkug/powerline signals. I had poweline to one distqnt room whcih would drop internet connection whenever a laptop was using a charger, and that happened with several powerlines and several laptops. Switched to more powerful WiFi extenders instead....
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