The display lighting is uneven: brighter in the middle and becomes somewhat darker toward the edges to the right and left and top and bottom. And fine darker vertical stripes are visible across the whole screen.
As a result of aging monitor alignments drift, giving rise a a myriad of odd symptoms. Open the monitor up (of course it's got to be off), locate the scanning coils on the neck of the tube. Right there on are disk-shaped permanent alignment magnets. The scanning coils are electromagnets that produce the raster (scanning pattern), while the low-strenght permanent magnets allow the alignment to be varied ever so finely. Chances are that this alignment has drifted. Reconnect and turn on the monitor and with something being displayed, turn the disks one-by-one, observing the effect on the screen (a large mirror in front of the monitor would help much). Note that normally the disks are secured at the factory using hot glue. You may want to warm up the glue before starting the re-adjustment to make it easier to turn the disks. I am quite certain that this will solve your problem.
SOURCE: colors around the edges wrong now I cleaned the inside of modem out
monitor is damaged I recommend replacement with a lighter more efficient flat panel of any size.
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