maximo: you are aware of the fact that YOUR gfx card WILL not show AGA and ECS /PAL/NTSC modes right? , you will need to BOOT into WB with your aga and go to screen mode and Activate a screenmode , then WB only will be in RTG!.. NOT the boot up menu etc ..
a good way to do this is , MOVE your Monitors driver called " Cybervision ??" along with all others than PAL AND NTSC (theese 2 must stay) into your Storage/monitor drawer.
Then do a reboot (still aga) ..Open your Screenmode prefs and you will notice there is no cybervision to selec, so go to storage/monitors and select THE one monitor (cybervision) and double click it , now open screenmode PREFS again and hopefully now you can select the modes and press test and your GFX card will show a test picture... if it does...then u are ok...
anyway i suggest that you should IGNORE Cybergrafix for now and just do an install of Picasso96 (its on your os3.5/3.9 cd , that installs much easier than cgfx...
goodluck-.... hope this helped