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Since monitors use a sync pulse to lock the picture, its possible that monitor has a problem there. While a tv has an analog signal and needs a defined sync pulse "blacker than black" as they were defined. A computer with blacker than black can occur in many places, and poor sync will show up differently, but may not appear wavy when poorly locked. I had a c-64 I hooked up to a sony B&W tv on the contrast control, to get better sync I use to poke black color into the screen background, and border color. Without that the lock was not in the right spot, and less stable.
Will that picture lock if you change the screen and background colors?
Can you reverse the colors, black writing on white screen?
Dead giveaway on a bad sync thing in that monitor.
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Yes you can call me "Squirrel boy"
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