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there might be a problem with the VGA driver. while booting, repeatedly press F8 until you get the boot options (black screen with white text) with your arrow keys, you select "boot in VGA mode"
then you can easily reinstall the video driver.
It sounds like the screen inverter is going out. The inverter works in this way: The power supply cuts the amount of power going into the board down, however the screen needs more power to enable it to function properly, so the inverter boosts the power back up to a level that the screen needs. If the inverter starts to go out it can create a multiple amount of indications that are noticable on the screen, one of them is darkening of the screen. It could also be the screen itself, but I'm leaning towards the inverter.