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Probably the color temperature setting or some other color settings - since you didn't specify your monitor's brand and model, it's hard to guess. Anyway, most monitors have a "Reset to factory defaults" feature - you may want to make use of this...
Much better if you change the color control on your PC. Or your desktop right click properties, On the Display properties click settings, under the setting select Advanced. Look for your videocard software control. It will let you adjust the Gamma, Contrast, Color control of your display properties.
The graphics card or onboard graphics driver may not be kicking in at boot up causing the monitor to shut down, check the graphics card connector for bent pins and both connector ends.
If you are able, think back to when this started and use system restore to a date before is started.
Also you may have inadvertantly updated your graphics driver with one of windows generic drivers, of which may be the cause.
You can also try pressing F8 on boot up and selecting 'last known good configuration' and see if that cures it.
Have you tried a different cable? It could be broken. On my Plus 91 with special software (Powerstrip) I can get the refresh rate up to 119Hz at 1024 x 768, but I use 1280 x 960 at 96Hz as it's the highest res I want to use for prolonged periods of time as 96Hz doesn't give me eyestrain no matter how long I stare at this thing.