Fn key not working in Sony Vaio [Closed]

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Please suggest me the solution for- Fn key not working like Fn+arrow to increase brightness and all. Please suggest step wise solution for Windows 10

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That is a computer specific feature. You must provide us with the ake and model so that we can google the software suite that is no longer installed onto your pc! What color is the FN key? What color is the Up arrow?