Why my computer screen is too dark?

I have an acer aspire one laptop... I unplugged to move it and it went dim, I plugged it back in and its still dim. The computer is only a years and theres nothing wrong with him, so far, I don't know what I have to do! Being sun screen is difficult to read, and it's bad for the eyes... What can I do to make my screen is Dim not more?

I have the same computer then follow the steps.
Start button > type troubleshooting > Enter > under system and security, click on search performance issues

If this does not resolve the problem, hold down the blue Fn key > right arrow

Tags: Windows

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