I have a Intra 14HP33T monochrome CGA monitor (white phosphor rebranded as Inves ) that has some problems. At power up, the image shows clear and crisp. Some minutes later, it starts to appear some kind of light noise or interference in the lighted zones, and minutes after the entire image starts to shake vertically (not dramatically, about only one or two lines).
What can be the cause? There are no CRT or other interference sources around. I have tested the monitor in two different computers and two different cards.
What can be the cause? There are no CRT or other interference sources around. I have tested the monitor in two different computers and two different cards.