If you experience interference then try and unplug a device from power and for a computer screen you can change the refresh rate and resoltion to see if the interference changes. I have had great success using extra shielded CAT 6 and CAT 7 network cables and using USB cables that has a ferrite lump to reduce RFI coming out of devices. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.