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Samsung laptop monitor brightness won't ajust by fn keys

Computer: Laptop Samsung R70
Here's what I've done: Instaled Vista premium windows ( original, got me a cd with a laptop); instaled video drivers ( from internet 179.67 for Nvidia GeForce 8400M GS, but I don't think this is a video card problem ); instaled all drivers from cd given with laptop made for Windows Vista

The problem: the brighness is allways mid dark. By presing Fn+(arrowup) - Fn+(brightnessup) and Fn+(arrowdown) - Fn+(brightnessdown) only the brightness bar apears, it shows that brightness is being ajusted but the brightness it self of the monitor doesn't.
Now I have Windows 7 Evaluation copy Build 7077, instaled same drivers, same thing ( doesn't ajust brightness, only it shows that is being ajusted ) I think the drivers should fit from vista and the problem is elsewhere.
Reistaling the drivers didn't help on Vista or on Windows 7, just made the brightness on full ( highest brightness) and that only last till next computer restart, then it's mid dark again. Ajusting power setings doesn't help either.
So the thing is that I'm tired of looking at the mid dark monitor, atleast it allways could be full brightness, I'd be happy anyway :)

P.S. sorry for my spelling

Thomas

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