Brightness problem - New Display, Old Mac Pro

Hello,
I'm having a problem with the brightness control on a new 24" LED display for my 2007 MacPro with 10.4.11. The display is attached with a Gefen dvi to mini plug adapter (+ usb). It is VERY bright and this display has no external brightness buttons. I'm using an extended aluminum wired keyboard and the brightness function keys on my keyboard are not responding. As far as I remember the brightness keys worked on my old monitor which recently passed away. I have run the latest update for keyboards for this OS.
Any possibility that this is an OS 10.4.11 issue? I also don't have a brightness slider in the system prefs>display like others (probably using a newer OS) have mentioned. Other forums have suggested everything from the adapter, to USB issues, to the possibility that Apple designed a monitor with no brightness control. (?)
Your knowledge and suggestions are greatly appreciated!
Jen

With the Gefen converter, you need to install software for brightness control.
<http://www.gefen.com/kvm/support/download/BrightnessControl.dmg>

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