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what model of monitor??
what model of monitor??
i would check the monitor in another game to see if its truly a monitor issue and not a game/power supply pcb issue.
those came with 4600s originally. so in addition to your signal header probably needing reflow work, the cards definitely will too on deflection headers and card plugs... permitting of course it's a 4600.
it's almost a guarantee it's a solder issue, because what you're seeing is the monitor clearing up once it's warmed up. anything thermal like that is typically in the solder, which eventually cracks over time from the heating and cooling cycles of turning the monitor on and off. additionally, the card headers on a 4600 take a lot of abuse from years of plugging and unplugging those cards, it stresses the solder joints to what is referred to as a halo, meaning you'll see a dark circle around the header pin where the solder broke off. the pin is therefore on an island then, not making contact with the traces, or poor or intermittent contact in this case.
it's due for service. any other monitor model, you're looking at the signal header, bare minimum.