My vote goes for the speakers right next to the monitor giving it the
"shakes".  I have seen $350 speakers in fine wood boxes bend images all
out of shape, while $20 speakers in steel boxes scarcely bothered it at
all.  The point is how well shielded the speakers are electromagnetically.

Incidentally, I once saw a computer store built directly over a subway
station.  When a train came into the station, all the images swayed
drunkenly to the left.  When it pulled out, they all lurched to the
right.  It didn't take long for the store to close.  Such is the power
and reach of the magnetic field of BIG traction motors.

I have also seen cases where "bad" power caused the image to "bloom"
(get bigger or smaller) as the voltage varied due to large variations in
the load on the local power grid.  This was usually most noticeable in
older, cheaper displays with poor internal voltage regulation (such as
an old "cheapie" MDA).  I was running an IBM monochrome VGA right off
the same power bar at the same time and it hardly moved while the
"cheapie" shrunk a good 1/2 inch on all sides.

Boyd Ramsay

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