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I have the same problem of the thread "Q: Sim City 4 Blinking SOLVED", see also the attachment.
But I have Intel + NVidia, not an ATI/AMD system.
Post edited June 20, 2022 by andy-drew
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I have already opened graphicrules.sgr, but don't understand anything about how to set it properly.

Nvidia GeForce RTX 3050 Ti Laptop
I tried some days ago to change these two text files with no result, so now I reverted them.