i'm unable to reduce my pc brightness???

[jayakumaralladi2662]

I'm Unable to reduce my pc's brightness...i have my brightness buttons..but my pc brightness is not reducing.....,actually i've the function button.....iam holding and pressing the brightness buttons...but it is not reducing..what the bloody problem with my pc

 

[Saga Lout]

If the brightness icons on the two Function keys are coloured blue, you need to hold the Fn while you press either one of the brightness adjusting buttons.