I had one case where the monitor and computer had to be moved to
another spot in the room. Interference was coming from a motor (like
the furnace) or other AC circuit in the house such as a fluorescent
light fixture. I forget what it was, it was something stupid. I do
not agree that speakers can cause this sort of problem. There is not
enough AC interference in that kind of circuitry. It is all low
voltage.
You should also check your AC outlet for proper wiring. You can get a
wall plug tester for under $10 at the hardware store. A poor ground,
or wrong wiring in the power plug, can cause weird problems that are
hard to track. This could be why I have no hair left.
Have you had recent alien visitations?
Good luck.
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