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One last thought that struck me...
Check the AC Plug (wall) wiring that the HOT is hot and neutral is neutral and not ground ON ALL COMPUTERS HARD WIRED TO THAT NETWORK. especially if your ground is not bonded to neutral. You may have a mismatch on one of them and the potential is there for ac noise floating lightly on the net lines if the case. If you do not know how to check that, or can't find someone who does, they make a led plug that will tell you the wiring status.(cheap enough)
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