Brightness control not working

[MS33]

Hallo,
for a few days now my brightness controls aren't working, either on the keyboard, nor in the Settings Menu. When i adjust the brightness the small indicator on the screen shows movement, but the brightness stays the same.

I will be very thankful for your support.

[Dudefoxlive]

Go to device manager and check and see if the display is enable, 

[MS33]

Thanks a lot, it lead me to the right place. I updated the graphics driver under display adaptors and now it's working again.