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The discoloration is called 'degauss', the monitor has a magnetic field and the earth does too, so they react sometimes and do that. It makes it worse if you move the game while powered up. You can fix it with a degauss ring, or with a strong electromagnetic, just get it near the screen, it'll screw the colors up really bad, then move it away from the screen until it looks better.
The monitor has a built in circuit that does this too, but sometimes if you get a bad corner like that it never gets better until you use an external ring on it.