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If these are also extremely dark it’s likely you have a hardware fault. When the computer starts to boot you should see some on screen messages. To confirm this, restart your computer while holding the SHIFT key (Windows -> Power -> HOLD SHIFT and click Restart). For example, the backlight on the screen is not working. If none of these options helped and your screen is extremely dark – it’s possible you have a hardware fault. If you’re using a desktop computer, the buttons are normally located to the side of the monitor. You may also need to use the FN (function) button on the keyboard to use these buttons. You should seen an icon on the button which represents the screen brightness being more or less. If you’re using a laptop computer, these are usually located on the keyboard under the F buttons (e.g. If neither of these options helped, you may need to adjust the brightness of your monitor using the adjustment options on the monitor. If the problem started after install windows 10 version 21H1, then make sure you have installed the latest Cumulative Update, As Microsoft mention: Addresses an issue with the brightness controls on some laptops after updating to the Windows Update. Option 3: Use the monitors brightness settings
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See: Windows 10 – How to disable automatic brightness adjustments Option 2: Adjust screen brightness After doing this my problem was fixed and I was able to adjust the brightness of my screen again. Note: for computers with a light sensor (typically laptop computers). Option 1: Disable automatic brightness adjustments Here’s a few ways to make the screen brighter.
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