When the brightness is reduced to a certain extent, many laptops will have the screen flicker, especially when the Windows 2000 shutdown operation selection screen stays. Some graphics cards (such as ATI Mobility Radeon 7500 or 9000 of some models) also automatically reduce the refresh rate after starting the power saving function, causing the laptop lcd module to flicker. Of course, this may also be caused by a problem with the light tube of the screen itself, but it is rare
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