You can try to Degauss the monitor. It still sounds like the video cable is bad. That last part you mentioned about the OSM (on-screen Menu) having normal colors comes from the monitor and has nothing to do with the cable or pc. That tells me its the video cable, or the video cable connector (pins maybe bad) or a bad connection somewhere. There could be a bad connector inside the monitor where the video cable is attached to the electronics board. Sometimes those contacts just get oxidized and quit transmitting a signal. They need a good cleaning.
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i've tried degaussing but no use. i knew that last point would help u cuz i too thought something same. so can i do it myself or do u want me to take it to some professional?
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