I have a partial solution, when I reboot I press option key and graphic board switch all resolution, press space on good resolution and automatically reboot whit my choice.

Why not save my choice? (remember pram is ok, clock is correct)

In the supervideo 2.7.5 control panel if I select a screen resolution tab the program say: "unable to comunicate with your video card", I need to use another type of db15>svga converter?