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Hp 540 laptop brightness control not working

\015 Clicking fn F7 and F8 to regulate the brightness on my hp 540 laptop does not change the brightness. Is there any software update etc that I need to do or is my laptop possibly spoilt?Cheers,Ryan\015

Answers :

Go to hp website to download the sp38171 which is the HP Quick Launch Button driver.
\015\012recently i purchased a HP540 laptop, was having the same issue like u all, so please install taht sp38171 to fix the function keys issue.
How to reprogram m lop top computer because there some viruz
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